Sarah Gibson https://www2.hao.ucar.edu/ en Synthetic Lyman-α Emissions for the coronagraph aboard the ASO-S mission I: an Eruptive Prominence-cavity System https://www2.hao.ucar.edu/news/publication-highlight/synthetic-lyman-emissions-coronagraph-aboard-aso-s-mission-i-eruptive <span class="field field--name-title field--type-string field--label-hidden">Synthetic Lyman-α Emissions for the coronagraph aboard the ASO-S mission I: an Eruptive Prominence-cavity System</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/6" typeof="schema:Person" property="schema:name" datatype="">whawkins</span></span> <span class="field field--name-created field--type-created field--label-hidden">Wed, 11/09/2022 - 14:09</span> <div class="layout__region--twocol d-grid d-print-flex with-sidebar"> <div class="layout__region layout__region--main-top breadcrumb-wrapper mt-2"> <div class="block block-system block-system-breadcrumb-block"> <nav class="mb-2 d-print-none" role="navigation" aria-labelledby="system-breadcrumb"> <h2 id="system-breadcrumb" class="visually-hidden">Breadcrumb</h2> <ol class="breadcrumb"> <li class="breadcrumb-item"> <a href="/">Home</a> </li> <li class="breadcrumb-item"> <a href="/taxonomy/term/15">Sarah Gibson</a> </li> </ol> </nav> </div> </div> <main class="layout__region layout__region--main main-content-wrapper"> <div class="block block-layout-builder block-extra-field-blocknodearticleauthor-and-created"> <div class="author_created row gx-0"> <div class="col"> <div class="fw-bold fs-6">Author:</div> <div class="author_created__name fs-6">whawkins</div> <div class="author_created__date text-gray-dark fs-6">Nov 9, 2022</div> </div> </div> </div> <div class="mt-3 mt-md-4 block block-layout-builder block-field-blocknodearticlefield-main-content"> <div class="field field--name-field-main-content field--type-entity-reference-revisions field--label-hidden field__items"> <div class="field__item"> <div class="paragraph paragraph--type--rich-text paragraph--view-mode--default"> <div class="clearfix text-formatted field field--name-field-body field--type-text-long field--label-hidden field__item"><p><em>Astronomy and Astrophysics</em>–J. Zhao, P. Zhang, S. E. Gibson, Y. Fan, L. Feng, F. Yu, H. Li, and W. Q. Gan</p> <p><em>Context—</em>Strong ultraviolet (UV) emission from the sun will be observed by the Lyman-α Solar Telescope (LST; Li et al. 2019) on board the Advanced Space-based Solar Observatory (ASO-S; Gan et al. 2019) which is scheduled for launch in 2022. It will provide continuous observations from the solar disk to the corona below 2.5 solar radius with high resolution. To configure appropriate observing modes and also to better understand observations in future, simulations and syntheses of different structures as well as different processes need to be done in advance. Aims. As prominence eruptions are main drivers of space weather, the need to monitor such phenomena has priority among the objectives of ASO-S mission. In this work, we synthesize the evolution of the prominence-cavity system before and during its eruption in the field-of-view (FOV) of LST.<br /> <em>Methods—</em>The input MHD model is adopted from Fan &amp; Liu (2019), which compares to the AIA observations quite well. The Lyman-α emission of the prominence and its eruptive counterparts are synthesized through the PRODOP code which considers NLTE radiative transfer processes, while the other coronal parts, e.g., the cavity and surrounding streamer, are synthesized with the FORWARD package that deals with optically-thin structures.<br /> <em>Results—</em>We present a discussion of the evolution of the eruptive prominence-cavity system, analyzing the synthetic emissions both on the disk near the limb and in the corona as viewed by the coronagraph, as well as the three-dimensional data of MHD simulations.<br /> (<em><a href="https://www.aanda.org/articles/aa/pdf/2022/09/aa43029-22.pdf">published version</a></em>)</p> <figure class="media media--type-image media--view-mode-default figure mb-1 mb-md-4"> <p> <img src="/sites/default/files/styles/extra_large/public/2022-11/Gibson_Lyman-alphaEmission2022.png?itok=I7a0oriS" width="926" height="340" alt="Lyman-α emission" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>Synthesized results of Lyman-α emission based on Fan &amp; Liu (2019) MHD prominence cavity simulation, shown for a slice centered on the plane-of-sky. The radiative component, the collisional component and ratio of the two components are shown from left to right. In the first two columns, contours are overlaid on the intensity maps to emphasize the structures. The horizontal line curves embedded in the figures in the third column shows evolutions of the ratio along the limb at Z=0. The vertical solid lines in black and white indicate the bottom and top of the central cavity, while the dashed line passes through the cavity. The dash-dotted line marks a location above the cavity and in the streamer.</p> </figcaption> </figure> </div> </div> </div> </div> </div> <div class="views-element-container block block-views block-views-blockarticles-recent-news"> <h2 class="mb-md-2">Recent News</h2> <div><div class="view view-articles view-id-articles view-display-id-recent_news js-view-dom-id-28efa2bfb8f990725fc697a1386c85d5e52f75384433681cefa1180e482c30d9"> <div class="view-content"> <div class="views-view-grid horizontal cols-3 col-12 mb-2 mb-md-4"> <div class="row row-cols-1 row-cols-sm-2 row-cols-md-3 g-2 g-md-4 row-1"> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/news-article/hawaiis-mauna-loa-erupts-after-38-years-mauna-loa-solar-observatory-temporarily" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-11/MLeruptionLava.png?itok=NHfdX7TB" width="480" 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class="card-title"> <a href="/news/publication-highlight/inter-hemispheric-asymmetries-high-latitude-electrodynamic-forcing-and"><span class="field field--name-title field--type-string field--label-hidden">Inter-Hemispheric Asymmetries in the High-Latitude Electrodynamic Forcing and the Thermosphere During the October 8-9, 2012 Geomagnetic Storm: An Integrated Data-Model Investigation</span> </a> </h3> </div> </div> </div> <div class="row row-cols-1 row-cols-sm-2 row-cols-md-3 g-2 g-md-4 row-4"> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/seasonal-variations-small-scale-waves-observed-icon-mighti" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Maute_perturbationAmplitudes.jpg?itok=BRSLJoPb" width="480" height="326" alt="Seasonal variations of monthly-zonal-mean small-scale perturbation amplitudes" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 18, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/seasonal-variations-small-scale-waves-observed-icon-mighti"><span class="field field--name-title field--type-string field--label-hidden">Seasonal Variations of Small-Scale Waves observed by ICON-MIGHTI</span> </a> </h3> </div> </div> </div> </div> </div> </div> </div> </div> <div class="block block-layout-builder block-field-blocknodearticlefield-story-date"> <div class="field field--name-field-story-date field--type-datetime field--label-above"> <div class="field__label">Date</div> <div class="field__item"><time datetime="2022-11-09T12:00:00Z" class="datetime">Wed, 11/09/2022 - 12:00</time> </div> </div> </div> </main> <aside class="layout__region layout__region--sidebar resources-wrapper d-print-none"> <div class="block block-layout-builder block-field-blocknodearticlefield-article-tags"> <div class="resources-wrapper d-print-none"> <div class="resources related mb-4"> <h2 class="p-2 px-md-3">Tags</h2> <div class="p-2 px-md-3 py-md-3"> <a href="/taxonomy/term/30" hreflang="en">Hanli Liu</a>, <a href="/taxonomy/term/15" hreflang="en">Sarah Gibson</a>, <a href="/taxonomy/term/26" hreflang="en">Yuhong Fan</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Wed, 09 Nov 2022 21:09:13 +0000 whawkins 754 at https://www2.hao.ucar.edu Coronal Cavities in CoMP Observations https://www2.hao.ucar.edu/news/publication-highlight/coronal-cavities-comp-observations <span class="field field--name-title field--type-string field--label-hidden">Coronal Cavities in CoMP Observations</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/6" typeof="schema:Person" property="schema:name" datatype="">whawkins</span></span> <span class="field field--name-created field--type-created field--label-hidden">Thu, 10/27/2022 - 10:59</span> <div class="layout__region--twocol d-grid d-print-flex with-sidebar"> <div class="layout__region layout__region--main-top breadcrumb-wrapper mt-2"> <div class="block block-system block-system-breadcrumb-block"> <nav class="mb-2 d-print-none" role="navigation" aria-labelledby="system-breadcrumb"> <h2 id="system-breadcrumb" class="visually-hidden">Breadcrumb</h2> <ol class="breadcrumb"> <li class="breadcrumb-item"> <a href="/">Home</a> </li> <li class="breadcrumb-item"> <a href="/taxonomy/term/15">Sarah Gibson</a> </li> </ol> </nav> </div> </div> <main class="layout__region layout__region--main main-content-wrapper"> <div class="block block-layout-builder block-extra-field-blocknodearticleauthor-and-created"> <div class="author_created row gx-0"> <div class="col"> <div class="fw-bold fs-6">Author:</div> <div class="author_created__name fs-6">whawkins</div> <div class="author_created__date text-gray-dark fs-6">Oct 27, 2022</div> </div> </div> </div> <div class="mt-3 mt-md-4 block block-layout-builder block-field-blocknodearticlefield-main-content"> <div class="field field--name-field-main-content field--type-entity-reference-revisions field--label-hidden field__items"> <div class="field__item"> <div class="paragraph paragraph--type--rich-text paragraph--view-mode--default"> <div class="clearfix text-formatted field field--name-field-body field--type-text-long field--label-hidden field__item"><p><em>Astrophysical Journal—A. Ruminska, U. Bak-Steslicka, <strong>S. E. Gibson</strong>, <strong>Y. Fan</strong></em></p> <figure class="align-right media media--type-image media--view-mode-default figure mb-1 mb-md-4"> <p> <img src="/sites/default/files/styles/extra_large/public/2022-10/Gibson_CavityWidths-SDO.AIA__0.png?itok=V1xwqhLe" width="926" height="976" alt="Cavity widths observed by SDO/AIA" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>Cavity widths observed by SDO/AIA plotted against sizes of their lagomorphic structures (top row). Cavity widths observed by SDO/AIA plotted against cavity widths observed by CoMP (bottom row, left). Cavity widths observed by CoMP plotted against sizes of their lagomorphic structures (bottom row, right). A sample contains 70 cavities.</p> </figcaption> </figure> <p>Quiescent coronal cavities can provide insight into solar magnetic fields. They are observed in the coronal emission lines in both polarized and unpolarized light. In the total linear polarization fraction (L/I), they often possess a "lagomorphic," or "rabbit-shaped," structure that reflects the underlying magnetic field configuration. We studied quiescent coronal cavities observed between 2012 and 2018 by the Coronal Multichannel Polarimeter (CoMP). The majority of cavities in our study had a characteristic lagomorphic structure in linear polarization. We additionally compared cavity widths as observed in intensity with sizes of their linear polarization signatures for 70 cavities and found that both features are strongly correlated. Our results indicate that chances for observing a lagomorphic structure increase greatly with cavity lifetime, suggesting that the visibility depends on the spatial orientation of the cavity. Forward-modeled observations in linear polarization of flux ropes confirmed this assumption. We conclude that observations of the solar coronal cavities in linear polarization are consistent with the theoretical model of flux rope formation and structure.</p> <p><a data-saferedirecturl="https://www.google.com/url?q=https://iopscience.iop.org/article/10.3847/1538-4357/ac469c/pdf&amp;source=gmail&amp;ust=1666476699234000&amp;usg=AOvVaw1Y35PxSOp9gHxdgwK4PkJB" href="https://iopscience.iop.org/article/10.3847/1538-4357/ac469c/pdf" target="_blank">https://iopscience.iop.org/<wbr></wbr>article/10.3847/1538-4357/<wbr></wbr>ac469c/pdf</a></p> </div> </div> </div> </div> </div> <div class="views-element-container block block-views block-views-blockarticles-recent-news"> <h2 class="mb-md-2">Recent News</h2> <div><div class="view view-articles view-id-articles view-display-id-recent_news js-view-dom-id-fc4bbc090148a66a5ca96ffe004c942f3be72e895cc48a86e5e0d5873541d918"> <div class="view-content"> <div class="views-view-grid horizontal cols-3 col-12 mb-2 mb-md-4"> <div class="row row-cols-1 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<div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/thermospheric-neutral-density-variation-during-spacex-storm-implications" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-11/Lin_NeutralDensity_star.png?itok=oSivicLn" width="467" height="480" alt="Neutral density variations along the Starlink orbit" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Nov 23, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/thermospheric-neutral-density-variation-during-spacex-storm-implications"><span class="field field--name-title field--type-string field--label-hidden">Thermospheric Neutral Density Variation during the &quot;SpaceX&quot; Storm: Implications from Physics-based Whole Geospace Modeling</span> 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field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/horizontal-wind-shears-lower-thermosphere-observed-icon" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Maute_maximumShear.jpg?itok=id9P5eHJ" width="480" height="241" alt="Example of maximum shear determination in zonal wind from 1 orbit of MIGHTI observations" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 14, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/horizontal-wind-shears-lower-thermosphere-observed-icon"><span class="field field--name-title field--type-string field--label-hidden">Horizontal wind shears in the lower thermosphere observed by ICON</span> </a> </h3> </div> </div> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/investigation-post-sunset-extra-electron-density-peak-poleward" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Qian%2CLiying_Lat-longDistr.NmF2simula.png?itok=HZnaJDN2" width="480" height="250" alt="Latitude-longitude distribution and NmF2 simulation" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 18, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/investigation-post-sunset-extra-electron-density-peak-poleward"><span class="field field--name-title field--type-string field--label-hidden">Investigation of the Post-Sunset Extra Electron Density Peak Poleward of the Equatorial Ionization Anomaly Southern Crest</span> </a> </h3> </div> </div> </div> <div class="row row-cols-1 row-cols-sm-2 row-cols-md-3 g-2 g-md-4 row-3"> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/lagrangian-study-tidal-advection-mesospheric-water-vapor" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Pedatella_DW1advectedH2O.png?itok=QXmqdjt2" width="479" height="480" alt="DW1 advected H2O volume mixing ratio" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 19, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/lagrangian-study-tidal-advection-mesospheric-water-vapor"><span class="field field--name-title field--type-string field--label-hidden">A Lagrangian Study of Tidal Advection of Mesospheric Water Vapor</span> </a> </h3> </div> </div> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/coronal-cavities-comp-observations" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Gibson_CavityWidths-SDO.AIA__0.png?itok=gN76eNR5" width="455" height="480" alt="Cavity widths observed by SDO/AIA" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 27, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/coronal-cavities-comp-observations"><span class="field field--name-title field--type-string field--label-hidden">Coronal Cavities in CoMP Observations</span> </a> </h3> </div> </div> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a 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row-cols-md-3 g-2 g-md-4 row-4"> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/seasonal-variations-small-scale-waves-observed-icon-mighti" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Maute_perturbationAmplitudes.jpg?itok=BRSLJoPb" width="480" height="326" alt="Seasonal variations of monthly-zonal-mean small-scale perturbation amplitudes" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 18, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/seasonal-variations-small-scale-waves-observed-icon-mighti"><span class="field field--name-title field--type-string field--label-hidden">Seasonal Variations of Small-Scale Waves observed by ICON-MIGHTI</span> </a> </h3> </div> </div> </div> </div> </div> </div> </div> </div> <div class="block block-layout-builder block-field-blocknodearticlefield-story-date"> <div class="field field--name-field-story-date field--type-datetime field--label-above"> <div class="field__label">Date</div> <div class="field__item"><time datetime="2022-10-27T12:00:00Z" class="datetime">Thu, 10/27/2022 - 12:00</time> </div> </div> </div> </main> <aside class="layout__region layout__region--sidebar resources-wrapper d-print-none"> <div class="block block-layout-builder block-field-blocknodearticlefield-article-tags"> <div class="resources-wrapper d-print-none"> <div class="resources related mb-4"> <h2 class="p-2 px-md-3">Tags</h2> <div class="p-2 px-md-3 py-md-3"> <a href="/taxonomy/term/15" hreflang="en">Sarah Gibson</a>, <a href="/taxonomy/term/26" hreflang="en">Yuhong Fan</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Thu, 27 Oct 2022 16:59:32 +0000 whawkins 748 at https://www2.hao.ucar.edu Tracking Movement Of Long-lived Equatorial Coronal Holes From Analysis Of Long-term McA Data https://www2.hao.ucar.edu/news/publication-highlight/tracking-movement-long-lived-equatorial-coronal-holes-analysis-long-term <span class="field field--name-title field--type-string field--label-hidden">Tracking Movement Of Long-lived Equatorial Coronal Holes From Analysis Of Long-term McA Data</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/6" typeof="schema:Person" property="schema:name" datatype="">whawkins</span></span> <span class="field field--name-created field--type-created field--label-hidden">Wed, 10/26/2022 - 11:58</span> <div class="layout__region--twocol d-grid d-print-flex with-sidebar"> <div class="layout__region layout__region--main-top breadcrumb-wrapper mt-2"> <div class="block block-system block-system-breadcrumb-block"> <nav class="mb-2 d-print-none" role="navigation" aria-labelledby="system-breadcrumb"> <h2 id="system-breadcrumb" class="visually-hidden">Breadcrumb</h2> <ol class="breadcrumb"> <li class="breadcrumb-item"> <a href="/">Home</a> </li> <li class="breadcrumb-item"> <a href="/taxonomy/term/15">Sarah Gibson</a> </li> </ol> </nav> </div> </div> <main class="layout__region layout__region--main main-content-wrapper"> <div class="block block-layout-builder block-extra-field-blocknodearticleauthor-and-created"> <div class="author_created row gx-0"> <div class="col"> <div class="fw-bold fs-6">Author:</div> <div class="author_created__name fs-6">whawkins</div> <div class="author_created__date text-gray-dark fs-6">Oct 26, 2022</div> </div> </div> </div> <div class="mt-3 mt-md-4 block block-layout-builder block-field-blocknodearticlefield-main-content"> <div class="field field--name-field-main-content field--type-entity-reference-revisions field--label-hidden field__items"> <div class="field__item"> <div class="paragraph paragraph--type--rich-text paragraph--view-mode--default"> <div class="clearfix text-formatted field field--name-field-body field--type-text-long field--label-hidden field__item"><p><em>Astrophysical Journal—Jacob Harris, <strong>Mausumi Dikpati</strong>, <strong>Ian Hewins</strong>, <strong>Sarah E. Gibson</strong>, <strong>Scott W. McIntosh</strong>, Subhamoy Chatterjee, Thomas Kuchar</em></p> <figure class="align-right media media--type-image media--view-mode-default figure mb-1 mb-md-4"> <p> <img src="/sites/default/files/styles/extra_large/public/2022-10/Dikpati_all_slopes_for_cyc23.png?itok=-82vJzCc" width="926" height="557" alt="all Coronal Holes centroids" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>Left panel: all Coronal Holes centroids (CH-centroids) analysed during the entire solar cycle 23. Positive (negative) CH-centroids are displayed in blue-filled (red-filled) circles, and straight line fits for each legacy number have been displayed in solid (dashed) black lines. The thick black line represents the average slope, calculated for all CH-centroids that recur for 7 or more CRs. The thick green line represents the slope obtained from the speed due to local differential rotation. Middle panel: enlarged inset of the region marked within two horizontal strips in left panel, for CRs between 1949 and 1990, namely during the late rising phase of cycle 23. Right panel: stack plot for the same period as in middle panel for CRs 1949-1990. Magenta-circled CH-centroids in left and middle panels indicate anomalous slopes.</p> </figcaption> </figure> <p>Features at the Sun's surface and atmosphere are constantly changing due to its magnetic field. The McIntosh Archive provides a long-term (45 yr) record of these features, digitized from hand-drawn synoptic maps by Patrick McIntosh. Utilizing this data, we create stack plots for coronal holes, i.e., Hovmöller-type plots of latitude bands, for all longitudes, stacked in time, allowing tracking of coronal hole movement. Using a newly developed two-step method of centroid calculation, which includes a Fourier descriptor to represent a coronal hole's boundary and calculate the centroid by the use of Green's theorem, we calculate the centroids of 31 unique, long-lived equatorial coronal holes for successive Carrington rotations during the entire solar cycle 23, and estimate their slopes (time versus longitude) as the coronal holes evolve. We compute coronal hole centroid drift speeds from these slopes, and find an eastward (prograde) pattern that is actually retrograde with respect to the local differential rotation. By discussing the plausible physical mechanisms which could cause these long-lived equatorial coronal holes to drift retrograde, we identify either classical or magnetically modified westward-propagating solar Rossby waves, with a speed of a few tens to a few hundreds of meters per second, to be the best candidate for governing the drift of deep-rooted, long-lived equatorial coronal holes. To explore plausible physics of why long-lived equatorial coronal holes appear few in number during solar minimum/early rising phase more statistics are required, which will be studied in future.</p> </div> </div> </div> </div> </div> <div class="views-element-container block block-views block-views-blockarticles-recent-news"> <h2 class="mb-md-2">Recent News</h2> <div><div class="view view-articles view-id-articles view-display-id-recent_news js-view-dom-id-e73743c32beb7820564029c2187505a5bbd2ded80d614e82e03bd761dd5237cf"> <div class="view-content"> <div class="views-view-grid horizontal cols-3 col-12 mb-2 mb-md-4"> <div class="row row-cols-1 row-cols-sm-2 row-cols-md-3 g-2 g-md-4 row-1"> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/news-article/hawaiis-mauna-loa-erupts-after-38-years-mauna-loa-solar-observatory-temporarily" hreflang="en"><img 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href="/news/publication-highlight/lagrangian-study-tidal-advection-mesospheric-water-vapor" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Pedatella_DW1advectedH2O.png?itok=QXmqdjt2" width="479" height="480" alt="DW1 advected H2O volume mixing ratio" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 19, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/lagrangian-study-tidal-advection-mesospheric-water-vapor"><span class="field field--name-title field--type-string field--label-hidden">A Lagrangian Study of Tidal Advection of Mesospheric Water Vapor</span> </a> </h3> </div> </div> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/coronal-cavities-comp-observations" hreflang="en"><img 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src="/sites/default/files/styles/large/public/2022-10/Zhu_Temporal%20variations%20of%20the%20ion%20convection%20boundary.png?itok=xU0LXQHY" width="480" height="255" alt="Temporal variations of the ion convection boundary" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 14, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/inter-hemispheric-asymmetries-high-latitude-electrodynamic-forcing-and"><span class="field field--name-title field--type-string field--label-hidden">Inter-Hemispheric Asymmetries in the High-Latitude Electrodynamic Forcing and the Thermosphere During the October 8-9, 2012 Geomagnetic Storm: An Integrated Data-Model Investigation</span> </a> </h3> </div> </div> </div> <div class="row row-cols-1 row-cols-sm-2 row-cols-md-3 g-2 g-md-4 row-4"> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/seasonal-variations-small-scale-waves-observed-icon-mighti" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Maute_perturbationAmplitudes.jpg?itok=BRSLJoPb" width="480" height="326" alt="Seasonal variations of monthly-zonal-mean small-scale perturbation amplitudes" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 18, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/seasonal-variations-small-scale-waves-observed-icon-mighti"><span class="field field--name-title field--type-string field--label-hidden">Seasonal Variations of Small-Scale Waves observed by ICON-MIGHTI</span> </a> </h3> </div> </div> </div> </div> </div> </div> </div> </div> <div class="block block-layout-builder block-field-blocknodearticlefield-story-date"> <div class="field field--name-field-story-date field--type-datetime field--label-above"> <div class="field__label">Date</div> <div class="field__item"><time datetime="2022-10-26T12:00:00Z" class="datetime">Wed, 10/26/2022 - 12:00</time> </div> </div> </div> </main> <aside class="layout__region layout__region--sidebar resources-wrapper d-print-none"> <div class="block block-layout-builder block-field-blocknodearticlefield-article-tags"> <div class="resources-wrapper d-print-none"> <div class="resources related mb-4"> <h2 class="p-2 px-md-3">Tags</h2> <div class="p-2 px-md-3 py-md-3"> <a href="/taxonomy/term/21" hreflang="en">Mausumi Dikpati</a>, <a href="/taxonomy/term/15" hreflang="en">Sarah Gibson</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Wed, 26 Oct 2022 17:58:56 +0000 whawkins 746 at https://www2.hao.ucar.edu COSMO white papers submitted to Heliophysics Decadal Survey https://www2.hao.ucar.edu/news/cosmo-news-article/cosmo-white-papers-submitted-heliophysics-decadal-survey <span class="field field--name-title field--type-string field--label-hidden">COSMO white papers submitted to Heliophysics Decadal Survey</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/3" typeof="schema:Person" property="schema:name" datatype="">kolinski</span></span> <span class="field field--name-created field--type-created field--label-hidden">Wed, 10/19/2022 - 08:46</span> <div class="layout__region--twocol d-grid d-print-flex with-sidebar"> <div class="layout__region layout__region--main-top breadcrumb-wrapper mt-2"> <div class="block block-system block-system-breadcrumb-block"> <nav class="mb-2 d-print-none" role="navigation" aria-labelledby="system-breadcrumb"> <h2 id="system-breadcrumb" class="visually-hidden">Breadcrumb</h2> <ol class="breadcrumb"> <li class="breadcrumb-item"> <a href="/">Home</a> </li> <li class="breadcrumb-item"> <a href="/taxonomy/term/15">Sarah Gibson</a> </li> </ol> </nav> </div> </div> <main class="layout__region layout__region--main main-content-wrapper"> <div class="block block-layout-builder block-extra-field-blocknodearticleauthor-and-created"> <div class="author_created row gx-0"> <div class="col"> <div class="fw-bold fs-6">Author:</div> <div class="author_created__name fs-6">kolinski</div> <div class="author_created__date text-gray-dark fs-6">Oct 19, 2022</div> </div> </div> </div> <div class="mt-3 mt-md-4 block block-layout-builder block-field-blocknodearticlefield-main-content"> <div class="field field--name-field-main-content field--type-entity-reference-revisions field--label-hidden field__items"> <div class="field__item"> <div class="paragraph paragraph--type--rich-text paragraph--view-mode--default"> <div class="clearfix text-formatted field field--name-field-body field--type-text-long field--label-hidden field__item"><p>In response to the Decadal Survey for Solar and Space Physics call for white papers, a set of documents describing the&nbsp;diagnostic power of the COSMO suite of instruments for improving our understanding of the solar atmosphere and building capacity for improved space weather forecasts.</p> <p>&nbsp;</p> <p><a data-saferedirecturl="https://www.google.com/url?q=http://surveygizmoresponseuploads.s3.amazonaws.com/fileuploads/623127/6920789/44-811fdb73eb7201b21fb3b5103d03a5d9_TomczykSteven.pdf&amp;source=gmail&amp;ust=1666270939073000&amp;usg=AOvVaw0QYwK7zS8LPDV5EmFD8Apj" href="http://surveygizmoresponseuploads.s3.amazonaws.com/fileuploads/623127/6920789/44-811fdb73eb7201b21fb3b5103d03a5d9_TomczykSteven.pdf" target="_blank">Tomczyk et al., COSMO: The COronal Solar Magnetism Observatory</a></p> <p><a data-saferedirecturl="https://www.google.com/url?q=http://surveygizmoresponseuploads.s3.amazonaws.com/fileuploads/623127/6920789/44-9a2ecd41f1e6b12da520057c1b747249_DeWijnAlfredG.pdf&amp;source=gmail&amp;ust=1666270939073000&amp;usg=AOvVaw3d3zI7rVNjt_59nw0KPZPe" href="http://surveygizmoresponseuploads.s3.amazonaws.com/fileuploads/623127/6920789/44-9a2ecd41f1e6b12da520057c1b747249_DeWijnAlfredG.pdf" target="_blank">de Wijn et al., COSMO ChroMag: The Chromosphere and Prominence Magnetometer</a></p> <p><a data-saferedirecturl="https://www.google.com/url?q=http://surveygizmoresponseuploads.s3.amazonaws.com/fileuploads/623127/6920789/181-e4637c303c1b15d333362072d6ff0779_BurkepileJoan.pdf&amp;source=gmail&amp;ust=1666270939073000&amp;usg=AOvVaw1cmhmjBU7nKHfZBWsleCmz" href="http://surveygizmoresponseuploads.s3.amazonaws.com/fileuploads/623127/6920789/181-e4637c303c1b15d333362072d6ff0779_BurkepileJoan.pdf" target="_blank">Burkepile et al., Observations for Improving SEP Forecasts and Warnings</a></p> <p><a data-saferedirecturl="https://www.google.com/url?q=http://surveygizmoresponseuploads.s3.amazonaws.com/fileuploads/623127/6920789/81-d1f811885119f00bf96407c0991e5e46_GibsonSarahE.pdf&amp;source=gmail&amp;ust=1666270939073000&amp;usg=AOvVaw3ytL3Rxp1EpV8hCcSqA4fa" href="http://surveygizmoresponseuploads.s3.amazonaws.com/fileuploads/623127/6920789/81-d1f811885119f00bf96407c0991e5e46_GibsonSarahE.pdf" target="_blank">Gibson et al., Coronal Polarimetry: Determining the Magnetic Origins of Coronal Mass Ejections</a></p> <p><a data-saferedirecturl="https://www.google.com/url?q=http://surveygizmoresponseuploads.s3.amazonaws.com/fileuploads/623127/6920789/181-297af28e3fce5f76c77d5637352bd327_LandiEnrico.pdf&amp;source=gmail&amp;ust=1666270939073000&amp;usg=AOvVaw3Gn5DdZ17gEdG4wC633ybO" href="http://surveygizmoresponseuploads.s3.amazonaws.com/fileuploads/623127/6920789/181-297af28e3fce5f76c77d5637352bd327_LandiEnrico.pdf" target="_blank">Landi et al., Coronal Spectral Diagnostics: The Coronal Solar Magnetism Observatory (COSMO)</a></p> <p><a data-saferedirecturl="https://www.google.com/url?q=http://surveygizmoresponseuploads.s3.amazonaws.com/fileuploads/623127/6920789/68-7d6a76f7328a77f6fffa7108268e54cb_MortonRichardJ.docx&amp;source=gmail&amp;ust=1666270939073000&amp;usg=AOvVaw0itEEBAhGxCYLrvDr_RKrd" href="http://surveygizmoresponseuploads.s3.amazonaws.com/fileuploads/623127/6920789/68-7d6a76f7328a77f6fffa7108268e54cb_MortonRichardJ.docx" target="_blank">Morton et al., Revealing the Sun's Alfvenic Waves</a></p> </div> </div> </div> </div> </div> <div class="views-element-container block block-views block-views-blockarticles-recent-news"> <h2 class="mb-md-2">Recent News</h2> <div><div class="view view-articles view-id-articles view-display-id-recent_news js-view-dom-id-415770fc3f7a8cd131b390a68ffb76e5fccf88c9abf0111ba6dddde0fad3900b"> <div class="view-content"> <div class="views-view-grid horizontal cols-3 col-12 mb-2 mb-md-4"> <div class="row 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row-cols-md-3 g-2 g-md-4 row-4"> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/seasonal-variations-small-scale-waves-observed-icon-mighti" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Maute_perturbationAmplitudes.jpg?itok=BRSLJoPb" width="480" height="326" alt="Seasonal variations of monthly-zonal-mean small-scale perturbation amplitudes" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 18, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/seasonal-variations-small-scale-waves-observed-icon-mighti"><span class="field field--name-title field--type-string field--label-hidden">Seasonal Variations of Small-Scale Waves observed by ICON-MIGHTI</span> </a> </h3> </div> </div> </div> </div> </div> </div> </div> </div> <div class="block block-layout-builder block-field-blocknodearticlefield-story-date"> <div class="field field--name-field-story-date field--type-datetime field--label-above"> <div class="field__label">Date</div> <div class="field__item"><time datetime="2022-10-19T12:00:00Z" class="datetime">Wed, 10/19/2022 - 12:00</time> </div> </div> </div> </main> <aside class="layout__region layout__region--sidebar resources-wrapper d-print-none"> <div class="block block-layout-builder block-field-blocknodearticlefield-article-tags"> <div class="resources-wrapper d-print-none"> <div class="resources related mb-4"> <h2 class="p-2 px-md-3">Tags</h2> <div class="p-2 px-md-3 py-md-3"> <a href="/taxonomy/term/40" hreflang="en">Alfred de Wijn</a>, <a href="/taxonomy/term/65" hreflang="en">Joan Burkepile</a>, <a href="/taxonomy/term/15" hreflang="en">Sarah Gibson</a>, <a href="/taxonomy/term/47" hreflang="en">Steven Tomczyk</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Wed, 19 Oct 2022 14:46:55 +0000 kolinski 744 at https://www2.hao.ucar.edu Sarah Gibson is a 2022 AGU Fellow https://www2.hao.ucar.edu/news/news-article/sarah-gibson-2022-agu-fellow <span class="field field--name-title field--type-string field--label-hidden">Sarah Gibson is a 2022 AGU Fellow</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/6" typeof="schema:Person" property="schema:name" datatype="">whawkins</span></span> <span class="field field--name-created field--type-created field--label-hidden">Tue, 09/20/2022 - 11:07</span> <div class="layout__region--twocol d-grid d-print-flex with-sidebar"> <div class="layout__region layout__region--main-top breadcrumb-wrapper mt-2"> <div class="block block-system block-system-breadcrumb-block"> <nav class="mb-2 d-print-none" role="navigation" aria-labelledby="system-breadcrumb"> <h2 id="system-breadcrumb" class="visually-hidden">Breadcrumb</h2> <ol class="breadcrumb"> <li class="breadcrumb-item"> <a href="/">Home</a> </li> <li class="breadcrumb-item"> <a href="/taxonomy/term/15">Sarah Gibson</a> </li> </ol> </nav> </div> </div> <main class="layout__region layout__region--main main-content-wrapper"> <div class="block block-layout-builder block-extra-field-blocknodearticleauthor-and-created"> <div class="author_created row gx-0"> <div class="col"> <div class="fw-bold fs-6">Author:</div> <div class="author_created__name fs-6">whawkins</div> <div class="author_created__date text-gray-dark fs-6">Sep 20, 2022</div> </div> </div> </div> <div class="mt-3 mt-md-4 block block-layout-builder block-field-blocknodearticlefield-main-content"> <div class="field field--name-field-main-content field--type-entity-reference-revisions field--label-hidden field__items"> <div class="field__item"> <div class="paragraph paragraph--type--rich-text paragraph--view-mode--default"> <div class="clearfix text-formatted field field--name-field-body field--type-text-long field--label-hidden field__item"><figure class="align-right media media--type-image media--view-mode-default figure mb-1 mb-md-4"> <p> <img src="/sites/default/files/styles/extra_large/public/2022-09/Gibson.png?itok=7W9H4RaW" width="926" height="1147" alt="Sarah Gibson smiling" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>Sarah Gibson</p> </figcaption> </figure> <p>HAO is absolutely thrilled to announce that our very own Sarah Gibson has become an AGU Fellow in the 2022 class as just released on 19 September by EOS Science News! Please join us in congratulating her on a well-deserved recognition of an impactful and successful career. </p> <p>Here is the citation: <b><i>For development of a breakthrough model for coronal mass ejections and leadership in forward-modeling and “Whole Heliosphere” community activities</i></b></p> <p><a href="https://eos.org/agu-news/agu-announces-the-2022-class-of-fellows">AGU Announces the 2022 Class of Fellows</a></p> </div> </div> </div> </div> </div> <div class="views-element-container block block-views block-views-blockarticles-recent-news"> <h2 class="mb-md-2">Recent News</h2> <div><div class="view view-articles view-id-articles view-display-id-recent_news js-view-dom-id-1e83549e47fe7efaee1808f1a0e85fe6a70aae1462af70e28d7102b4ccf5d7c7"> <div class="view-content"> <div class="views-view-grid horizontal cols-3 col-12 mb-2 mb-md-4"> <div class="row row-cols-1 row-cols-sm-2 row-cols-md-3 g-2 g-md-4 row-1"> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field 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class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/news-article/remembering-charlie-garcia" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-11/17.charlie_garcia_4.jpg?itok=4aE7GWqs" width="309" height="480" alt="Charlie outdoors at Mauna Loa with windswept hair" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Nov 3, 2022</div> <h3 class="card-title"> <a href="/news/news-article/remembering-charlie-garcia"><span class="field field--name-title field--type-string field--label-hidden">Remembering Charlie Garcia</span> </a> </h3> </div> </div> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a 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field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/seasonal-variations-small-scale-waves-observed-icon-mighti" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Maute_perturbationAmplitudes.jpg?itok=BRSLJoPb" width="480" height="326" alt="Seasonal variations of monthly-zonal-mean small-scale perturbation amplitudes" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 18, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/seasonal-variations-small-scale-waves-observed-icon-mighti"><span class="field field--name-title field--type-string field--label-hidden">Seasonal Variations of Small-Scale Waves observed by ICON-MIGHTI</span> </a> </h3> </div> </div> </div> </div> </div> </div> </div> </div> <div class="block block-layout-builder block-field-blocknodearticlefield-story-date"> <div class="field field--name-field-story-date field--type-datetime field--label-above"> <div class="field__label">Date</div> <div class="field__item"><time datetime="2022-09-20T12:00:00Z" class="datetime">Tue, 09/20/2022 - 12:00</time> </div> </div> </div> </main> <aside class="layout__region layout__region--sidebar resources-wrapper d-print-none"> <div class="block block-layout-builder block-field-blocknodearticlefield-article-tags"> <div class="resources-wrapper d-print-none"> <div class="resources related mb-4"> <h2 class="p-2 px-md-3">Tags</h2> <div class="p-2 px-md-3 py-md-3"> <a href="/taxonomy/term/15" hreflang="en">Sarah Gibson</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Tue, 20 Sep 2022 17:07:09 +0000 whawkins 702 at https://www2.hao.ucar.edu Study of Coronal Hole Lifetimes https://www2.hao.ucar.edu/news/publication-highlight/study-coronal-hole-lifetimes <span class="field field--name-title field--type-string field--label-hidden">Study of Coronal Hole Lifetimes</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/6" typeof="schema:Person" property="schema:name" datatype="">whawkins</span></span> <span class="field field--name-created field--type-created field--label-hidden">Wed, 08/31/2022 - 14:29</span> <div class="layout__region--twocol d-grid d-print-flex with-sidebar"> <div class="layout__region layout__region--main-top breadcrumb-wrapper mt-2"> <div class="block block-system block-system-breadcrumb-block"> <nav class="mb-2 d-print-none" role="navigation" aria-labelledby="system-breadcrumb"> <h2 id="system-breadcrumb" class="visually-hidden">Breadcrumb</h2> <ol class="breadcrumb"> <li class="breadcrumb-item"> <a href="/">Home</a> </li> <li class="breadcrumb-item"> <a href="/taxonomy/term/15">Sarah Gibson</a> </li> </ol> </nav> </div> </div> <main class="layout__region layout__region--main main-content-wrapper"> <div class="block block-layout-builder block-extra-field-blocknodearticleauthor-and-created"> <div class="author_created row gx-0"> <div class="col"> <div class="fw-bold fs-6">Author:</div> <div class="author_created__name fs-6">whawkins</div> <div class="author_created__date text-gray-dark fs-6">Aug 31, 2022</div> </div> </div> </div> <div class="mt-3 mt-md-4 block block-layout-builder block-field-blocknodearticlefield-main-content"> <div class="field field--name-field-main-content field--type-entity-reference-revisions field--label-hidden field__items"> <div class="field__item"> <div class="paragraph paragraph--type--rich-text paragraph--view-mode--default"> <div class="clearfix text-formatted field field--name-field-body field--type-text-long field--label-hidden field__item"><figure class="align-right media media--type-image media--view-mode-default figure mb-1 mb-md-4"> <p> <img src="/sites/default/files/styles/extra_large/public/2022-08/Gibson_CoronalHole.png?itok=qDJ8SibT" width="926" height="1450" alt="Coronal hole centroid latitude vs. Carrington Rotation" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>Coronal hole centroid latitude vs. Carrington Rotation (bottom) and year (top) for almost three solar cycles (SC21-23). Red represents negative polarity and blue represents positive polarity, with the darker shades representing longer lifetimes, i.e., the number of rotations a given coronal hole or grouping of coronal holes recurs (assuming a rigid 27.3 day rotation rate). Note that coronal holes that last for more than one rotation are plotted for each rotation at the location of their centroid position for that rotation. The 11-year magnetic polarity change at  the poles  as  seen  with  coronal  holes  is  clear  as  is  the  slight asymmetry  of  the  evolution of coronal holes at each pole – i.e., the new polarity coronal hole appears at the north poleslightly before the south pole. The beginning of the solar cycles are marked with a vertical dashed line and based on Sunspot Index and Long-term Solar Observations (SILSO) sunspot numbers.</p> <p class=""><small><em>Version 2; SILSO data available from Royal Observatory of Belgium, Brussels</em></small></p> </figcaption> </figure> <p><strong>Ian Hewins</strong>, <strong>Sarah Gibson</strong>, David Webb, <strong>Bob McFadden</strong>, Thomas Kuchar, and <strong>Barbara Emery-Geiger</strong></p> <p>Using the McIntosh Archive of solar features, we analyze the evolution of coronal holes over more than three solar cycles. We demonstrate that coronal hole positions and lifetimes change dramatically on time scales from months to yrs, and that the pattern of these changes is clearly linked to the solar activity cycle. We demonstrate that the lifetimes of low-latitude coronal holes are usually less than one rotation but may extend to as long as three years. When plotted over time, the positions of low latitude coronal holes that remain visible for over one rotation track the sunspot butterfly diagram in terms of their positions on the sun over a solar cycle. Finally, we confirm that coronal holes do not in general rigidly rotate.</p> </div> </div> </div> </div> </div> <div class="views-element-container block block-views block-views-blockarticles-recent-news"> <h2 class="mb-md-2">Recent News</h2> <div><div class="view view-articles view-id-articles view-display-id-recent_news js-view-dom-id-b6748c30dcc4feb786fdf8db3993ebd05bd27c99f143454fe11aa6e3acf1f9f5"> <div class="view-content"> <div class="views-view-grid horizontal cols-3 col-12 mb-2 mb-md-4"> <div class="row row-cols-1 row-cols-sm-2 row-cols-md-3 g-2 g-md-4 row-1"> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/news-article/hawaiis-mauna-loa-erupts-after-38-years-mauna-loa-solar-observatory-temporarily" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-11/MLeruptionLava.png?itok=NHfdX7TB" width="480" height="320" alt="Mauna Loa 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orbit" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Nov 23, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/thermospheric-neutral-density-variation-during-spacex-storm-implications"><span class="field field--name-title field--type-string field--label-hidden">Thermospheric Neutral Density Variation during the &quot;SpaceX&quot; Storm: Implications from Physics-based Whole Geospace Modeling</span> </a> </h3> </div> </div> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/synthetic-lyman-emissions-coronagraph-aboard-aso-s-mission-i-eruptive" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-11/Gibson_Lyman-alphaEmission2022.png?itok=7XE1F3AA" width="480" height="176" 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text-gray-dark text-uppercase date--sm">Oct 18, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/investigation-post-sunset-extra-electron-density-peak-poleward"><span class="field field--name-title field--type-string field--label-hidden">Investigation of the Post-Sunset Extra Electron Density Peak Poleward of the Equatorial Ionization Anomaly Southern Crest</span> </a> </h3> </div> </div> </div> <div class="row row-cols-1 row-cols-sm-2 row-cols-md-3 g-2 g-md-4 row-3"> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/lagrangian-study-tidal-advection-mesospheric-water-vapor" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Pedatella_DW1advectedH2O.png?itok=QXmqdjt2" width="479" height="480" alt="DW1 advected H2O volume mixing ratio" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 19, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/lagrangian-study-tidal-advection-mesospheric-water-vapor"><span class="field field--name-title field--type-string field--label-hidden">A Lagrangian Study of Tidal Advection of Mesospheric Water Vapor</span> </a> </h3> </div> </div> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/coronal-cavities-comp-observations" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Gibson_CavityWidths-SDO.AIA__0.png?itok=gN76eNR5" width="455" height="480" alt="Cavity widths observed by SDO/AIA" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 27, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/coronal-cavities-comp-observations"><span class="field field--name-title field--type-string field--label-hidden">Coronal Cavities in CoMP Observations</span> </a> </h3> </div> </div> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/inter-hemispheric-asymmetries-high-latitude-electrodynamic-forcing-and" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Zhu_Temporal%20variations%20of%20the%20ion%20convection%20boundary.png?itok=xU0LXQHY" width="480" height="255" alt="Temporal variations of the ion convection boundary" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 14, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/inter-hemispheric-asymmetries-high-latitude-electrodynamic-forcing-and"><span class="field field--name-title field--type-string field--label-hidden">Inter-Hemispheric Asymmetries in the High-Latitude Electrodynamic Forcing and the Thermosphere During the October 8-9, 2012 Geomagnetic Storm: An Integrated Data-Model Investigation</span> </a> </h3> </div> </div> </div> <div class="row row-cols-1 row-cols-sm-2 row-cols-md-3 g-2 g-md-4 row-4"> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/seasonal-variations-small-scale-waves-observed-icon-mighti" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Maute_perturbationAmplitudes.jpg?itok=BRSLJoPb" width="480" height="326" alt="Seasonal variations of monthly-zonal-mean small-scale perturbation amplitudes" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 18, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/seasonal-variations-small-scale-waves-observed-icon-mighti"><span class="field field--name-title field--type-string field--label-hidden">Seasonal Variations of Small-Scale Waves observed by ICON-MIGHTI</span> </a> </h3> </div> </div> </div> </div> </div> </div> </div> </div> <div class="block block-layout-builder block-field-blocknodearticlefield-story-date"> <div class="field field--name-field-story-date field--type-datetime field--label-above"> <div class="field__label">Date</div> <div class="field__item"><time datetime="2022-08-31T12:00:00Z" class="datetime">Wed, 08/31/2022 - 12:00</time> </div> </div> </div> </main> <aside class="layout__region layout__region--sidebar resources-wrapper d-print-none"> <div class="block block-layout-builder block-field-blocknodearticlefield-article-tags"> <div class="resources-wrapper d-print-none"> <div class="resources related mb-4"> <h2 class="p-2 px-md-3">Tags</h2> <div class="p-2 px-md-3 py-md-3"> <a href="/taxonomy/term/15" hreflang="en">Sarah Gibson</a>, <a href="/taxonomy/term/3" hreflang="en">corona</a>, <a href="/taxonomy/term/60" hreflang="en">solar cycle</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Wed, 31 Aug 2022 20:29:27 +0000 whawkins 690 at https://www2.hao.ucar.edu Designing a New Coronal Magnetic Field Energy Diagnostic https://www2.hao.ucar.edu/news/publication-highlight/designing-new-coronal-magnetic-field-energy-diagnostic <span class="field field--name-title field--type-string field--label-hidden">Designing a New Coronal Magnetic Field Energy Diagnostic</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/6" typeof="schema:Person" property="schema:name" datatype="">whawkins</span></span> <span class="field field--name-created field--type-created field--label-hidden">Wed, 08/31/2022 - 13:43</span> <div class="layout__region--twocol d-grid d-print-flex with-sidebar"> <div class="layout__region layout__region--main-top breadcrumb-wrapper mt-2"> <div class="block block-system block-system-breadcrumb-block"> <nav class="mb-2 d-print-none" role="navigation" aria-labelledby="system-breadcrumb"> <h2 id="system-breadcrumb" class="visually-hidden">Breadcrumb</h2> <ol class="breadcrumb"> <li class="breadcrumb-item"> <a href="/">Home</a> </li> <li class="breadcrumb-item"> <a href="/taxonomy/term/15">Sarah Gibson</a> </li> </ol> </nav> </div> </div> <main class="layout__region layout__region--main main-content-wrapper"> <div class="block block-layout-builder block-extra-field-blocknodearticleauthor-and-created"> <div class="author_created row gx-0"> <div class="col"> <div class="fw-bold fs-6">Author:</div> <div class="author_created__name fs-6">whawkins</div> <div class="author_created__date text-gray-dark fs-6">Aug 31, 2022</div> </div> </div> </div> <div class="mt-3 mt-md-4 block block-layout-builder block-field-blocknodearticlefield-main-content"> <div class="field field--name-field-main-content field--type-entity-reference-revisions field--label-hidden field__items"> <div class="field__item"> <div class="paragraph paragraph--type--rich-text paragraph--view-mode--default"> <div class="clearfix text-formatted field field--name-field-body field--type-text-long field--label-hidden field__item"><p>In the solar corona, the free energy, i.e., the excess in magnetic energy over a ground-state potential field, forms the reservoir of energy that can be released during solar flares and coronal mass ejections. Such a free energy further provides a measure of non-potentiality of the magnetic field. Recent theoretical studies indicate that the presence of non-potential magnetic fields is imprinted into the structures of infrared, off-limb, coronal polarization. Thanks to the Coronal Multichannel Polarimeter, coronal linear polarization observations are now available on a daily basis and have been demonstrated to be useful for diagnosing properties of the coronal magnetic field. Future telescopes such as the Daniel K. Inouye Solar Telescope and the proposed Coronal Solar Magnetism Observatory Large Coronagraph will yield circular polarization measurements in the corona. In this paper, we investigate the possibility of exploiting such observations for mapping and studying the accumulation and release of coronal free magnetic energy, with the goal of developing a new tool for identifying "hot spots" of coronal free energy such as those associated with twisted and/or sheared coronal magnetic fields. We applied forward modeling of infrared coronal polarimetry to three-dimensional models of non-potential and potential magnetic fields. From these we defined a diagnostic of non-potentiality that in future could be calculated from a comparison of infrared, o-limb, coronal polarization observations and the corresponding polarization signal forward-modeled from a potential field extrapolated from photospheric magnetograms. We considered the relative diagnostic potential of linear and circular polarization, and the sensitivities of these diagnostics to coronal density distributions and assumed boundary conditions of the potential field. Our work confirms the capacity of polarization measurements for diagnosing non-potentiality and free energy in the solar corona.</p> <figure class="media media--type-image media--view-mode-default figure mb-1 mb-md-4"> <p> <img src="/sites/default/files/styles/extra_large/public/2022-08/Gibson_energizedFlux-rope.png?itok=iBKNtOp0" width="926" height="235" alt="Non-potentiality diagnostics of the energized flux-rope simulation at time step 89" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>Non-potentiality diagnostics of the energized flux-rope simulation at time step 89, computed from the fraction of circular polarization, V/I, using a potential field source surface simulation as reference.  First column: V/I two-dimensional map forward modeled from the flux-rope simulation. Second  column: V/I map  forward modeled from the potential  field. Third  column:  non-potentiality map  (squared difference between energized flux-rope simulation V/I and potential field V/I). Fourth column:  two-dimensional map column density integral of non-potential energy calculated from difference of the ground-truth simulation magnetic energy and the potential field magnetic energy. Green lines represent. the POS direction of the magnetic field.  Solid yellow line indicates the surface of the Sun.</p> </figcaption> </figure> <p><em><a href="https://ui.adsabs.harvard.edu/abs/2021ApJ...907...23C/abstract">The Astrophysical Journal (abstract)</a></em></p> </div> </div> </div> </div> </div> <div class="views-element-container block block-views block-views-blockarticles-recent-news"> <h2 class="mb-md-2">Recent News</h2> <div><div class="view view-articles view-id-articles view-display-id-recent_news js-view-dom-id-27965247452ef4cbe4bdc6a69fdf454e54ad21734571c08282372cf7494cfe45"> <div class="view-content"> <div class="views-view-grid horizontal cols-3 col-12 mb-2 mb-md-4"> <div class="row row-cols-1 row-cols-sm-2 row-cols-md-3 g-2 g-md-4 row-1"> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a 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href="/news/publication-highlight/thermospheric-neutral-density-variation-during-spacex-storm-implications" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-11/Lin_NeutralDensity_star.png?itok=oSivicLn" width="467" height="480" alt="Neutral density variations along the Starlink orbit" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Nov 23, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/thermospheric-neutral-density-variation-during-spacex-storm-implications"><span class="field field--name-title field--type-string field--label-hidden">Thermospheric Neutral Density Variation during the &quot;SpaceX&quot; Storm: Implications from Physics-based Whole Geospace Modeling</span> </a> </h3> </div> </div> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/synthetic-lyman-emissions-coronagraph-aboard-aso-s-mission-i-eruptive" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-11/Gibson_Lyman-alphaEmission2022.png?itok=7XE1F3AA" width="480" height="176" alt="Lyman-alpha emission" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Nov 9, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/synthetic-lyman-emissions-coronagraph-aboard-aso-s-mission-i-eruptive"><span class="field field--name-title field--type-string field--label-hidden">Synthetic Lyman-α Emissions for the coronagraph aboard the ASO-S mission I: an Eruptive Prominence-cavity System</span> </a> </h3> </div> </div> </div> <div class="row row-cols-1 row-cols-sm-2 row-cols-md-3 g-2 g-md-4 row-2"> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/news-article/remembering-charlie-garcia" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-11/17.charlie_garcia_4.jpg?itok=4aE7GWqs" width="309" height="480" alt="Charlie outdoors at Mauna Loa with windswept hair" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Nov 3, 2022</div> <h3 class="card-title"> <a href="/news/news-article/remembering-charlie-garcia"><span class="field field--name-title field--type-string field--label-hidden">Remembering Charlie Garcia</span> </a> </h3> </div> </div> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/horizontal-wind-shears-lower-thermosphere-observed-icon" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Maute_maximumShear.jpg?itok=id9P5eHJ" width="480" height="241" alt="Example of maximum shear determination in zonal wind from 1 orbit of MIGHTI observations" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 14, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/horizontal-wind-shears-lower-thermosphere-observed-icon"><span class="field field--name-title field--type-string field--label-hidden">Horizontal wind shears in the lower thermosphere observed by ICON</span> </a> </h3> </div> </div> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/investigation-post-sunset-extra-electron-density-peak-poleward" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Qian%2CLiying_Lat-longDistr.NmF2simula.png?itok=HZnaJDN2" width="480" height="250" alt="Latitude-longitude distribution and NmF2 simulation" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 18, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/investigation-post-sunset-extra-electron-density-peak-poleward"><span class="field field--name-title field--type-string field--label-hidden">Investigation of the Post-Sunset Extra Electron Density Peak Poleward of the Equatorial Ionization Anomaly Southern Crest</span> </a> </h3> </div> </div> </div> <div class="row row-cols-1 row-cols-sm-2 row-cols-md-3 g-2 g-md-4 row-3"> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/lagrangian-study-tidal-advection-mesospheric-water-vapor" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Pedatella_DW1advectedH2O.png?itok=QXmqdjt2" width="479" height="480" alt="DW1 advected H2O volume mixing ratio" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 19, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/lagrangian-study-tidal-advection-mesospheric-water-vapor"><span class="field field--name-title field--type-string field--label-hidden">A Lagrangian Study of Tidal Advection of Mesospheric Water Vapor</span> </a> </h3> </div> </div> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/coronal-cavities-comp-observations" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Gibson_CavityWidths-SDO.AIA__0.png?itok=gN76eNR5" width="455" height="480" alt="Cavity widths observed by SDO/AIA" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 27, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/coronal-cavities-comp-observations"><span class="field field--name-title field--type-string field--label-hidden">Coronal Cavities in CoMP Observations</span> </a> </h3> </div> </div> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/inter-hemispheric-asymmetries-high-latitude-electrodynamic-forcing-and" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Zhu_Temporal%20variations%20of%20the%20ion%20convection%20boundary.png?itok=xU0LXQHY" width="480" height="255" alt="Temporal variations of the ion convection boundary" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 14, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/inter-hemispheric-asymmetries-high-latitude-electrodynamic-forcing-and"><span class="field field--name-title field--type-string field--label-hidden">Inter-Hemispheric Asymmetries in the High-Latitude Electrodynamic Forcing and the Thermosphere During the October 8-9, 2012 Geomagnetic Storm: An Integrated Data-Model Investigation</span> </a> </h3> </div> </div> </div> <div class="row row-cols-1 row-cols-sm-2 row-cols-md-3 g-2 g-md-4 row-4"> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/seasonal-variations-small-scale-waves-observed-icon-mighti" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Maute_perturbationAmplitudes.jpg?itok=BRSLJoPb" width="480" height="326" alt="Seasonal variations of monthly-zonal-mean small-scale perturbation amplitudes" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 18, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/seasonal-variations-small-scale-waves-observed-icon-mighti"><span class="field field--name-title field--type-string field--label-hidden">Seasonal Variations of Small-Scale Waves observed by ICON-MIGHTI</span> </a> </h3> </div> </div> </div> </div> </div> </div> </div> </div> <div class="block block-layout-builder block-field-blocknodearticlefield-story-date"> <div class="field field--name-field-story-date field--type-datetime field--label-above"> <div class="field__label">Date</div> <div class="field__item"><time datetime="2022-08-31T12:00:00Z" class="datetime">Wed, 08/31/2022 - 12:00</time> </div> </div> </div> </main> <aside class="layout__region layout__region--sidebar resources-wrapper d-print-none"> <div class="block block-layout-builder block-field-blocknodearticlefield-article-tags"> <div class="resources-wrapper d-print-none"> <div class="resources related mb-4"> <h2 class="p-2 px-md-3">Tags</h2> <div class="p-2 px-md-3 py-md-3"> <a href="/taxonomy/term/54" hreflang="en">Anna Malanushenko</a>, <a href="/taxonomy/term/15" hreflang="en">Sarah Gibson</a>, <a href="/taxonomy/term/26" hreflang="en">Yuhong Fan</a>, <a href="/taxonomy/term/14" hreflang="en">solar magnetism</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Wed, 31 Aug 2022 19:43:18 +0000 whawkins 689 at https://www2.hao.ucar.edu Global Maps of the Magnetic Field in the Solar Corona https://www2.hao.ucar.edu/news/news-article/global-maps-magnetic-field-solar-corona <span class="field field--name-title field--type-string field--label-hidden">Global Maps of the Magnetic Field in the Solar Corona</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/3" typeof="schema:Person" property="schema:name" datatype="">kolinski</span></span> <span class="field field--name-created field--type-created field--label-hidden">Tue, 11/23/2021 - 09:05</span> <div class="layout__region--twocol d-grid d-print-flex with-sidebar"> <div class="layout__region layout__region--main-top breadcrumb-wrapper mt-2"> <div class="block block-system block-system-breadcrumb-block"> <nav class="mb-2 d-print-none" role="navigation" aria-labelledby="system-breadcrumb"> <h2 id="system-breadcrumb" class="visually-hidden">Breadcrumb</h2> <ol class="breadcrumb"> <li class="breadcrumb-item"> <a href="/">Home</a> </li> <li class="breadcrumb-item"> <a href="/taxonomy/term/15">Sarah Gibson</a> </li> </ol> </nav> </div> </div> <main class="layout__region layout__region--main main-content-wrapper"> <div class="block block-layout-builder block-extra-field-blocknodearticleauthor-and-created"> <div class="author_created row gx-0"> <div class="col"> <div class="fw-bold fs-6">Author:</div> <div class="author_created__name fs-6">kolinski</div> <div class="author_created__date text-gray-dark fs-6">Nov 23, 2021</div> </div> </div> </div> <div class="mt-3 mt-md-4 block block-layout-builder block-field-blocknodearticlefield-main-content"> <div class="field field--name-field-main-content field--type-entity-reference-revisions field--label-hidden field__items"> <div class="field__item"> <div class="paragraph paragraph--type--rich-text paragraph--view-mode--default"> <div class="clearfix text-formatted field field--name-field-body field--type-text-long field--label-hidden field__item"><p>An international team led by solar physicists from Peking University, China and National Center for Atmospheric Research (NCAR), USA, has recently measured the global magnetic field of the solar corona for the first time. The team used observations from the Coronal Multi-channel Polarimeter, an instrument operated by NCAR’s High Altitude Observatory. Their results have been published in the Science magazine on August 7, 2020.</p> <figure class="align-left media media--type-image media--view-mode-default figure mb-1 mb-md-4"> <p> <img src="/sites/default/files/styles/extra_large/public/2021-11/Model-of-MagneticField.jpg?itok=g5KigS2o" width="926" height="925" alt="Magnetic field of the Sun" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>Magnetic field of the Sun calculated from the potential field source surface model (Yang, Tian, Tomczyk et al. 2020, Sci China Tech Sci).</p> </figcaption> </figure> <p>The Sun is a magnetized star, and its magnetic field plays a critical role in shaping the solar atmosphere. The 11-year solar cycle, the spectacular solar eruptions and the million-degree solar corona are all driven or governed by the evolution of the solar magnetic field. Due to the magnetic coupling of different atmospheric layers, information on the magnetic field of the whole atmosphere is required to study the interplay between the solar plasma and magnetic field. However, routine measurements of the solar magnetic field have only been achieved at the photospheric level (solar surface). More than one century has passed since the first measurement of the solar magnetic field, we still do not have a precise knowledge of the magnetic field in the upper solar atmosphere, especially the corona, which impedes our complete understanding of the solar magnetism and its interaction with the solar plasma.</p> <p>More than 20 years ago, a technique called coronal seismology or magnetoseismology has been introduced for coronal magnetic field diagnostics. This method makes use of magnetohydrodynamic (MHD) oscillations or waves that are observed in coronal loops or other coronal structures. From the MHD theory, the observed wave parameters can be used to infer the average magnitudes of the magnetic field in the oscillating structures. However, these oscillations/waves are just occasionally observed in small regions of the corona, and thus their potential for magnetic field diagnostics is limited.</p> <figure class="align-right media media--type-image media--view-mode-default figure mb-1 mb-md-4"> <p> <img src="/sites/default/files/styles/extra_large/public/2021-11/CoronalImage-with-MagneticFieldMap.png?itok=pKetmxo9" width="926" height="475" alt="A coronal image and the corresponding magnetic field map" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>A coronal image (left) and the corresponding magnetic field map (right) (Yang, Bethge, Tian, Tomczyk, et al. 2020, Science).</p> </figcaption> </figure> <p>CoMP is a coronagraph with a 20-cm aperture. Using the Fe XIII 1074.7 nm and 1079.8 nm infrared spectral lines, it can observe the solar corona in the range of about 1.05 to 1.35 solar radii from the solar center through imaging spectroscopy and spectropolarimetry. The Doppler image sequence obtained from CoMP observations often reveal the prevalence of propagating periodic disturbances, indicating the ubiquitous presence of transverse MHD waves in the corona. The team has successfully applied the magnetoseismology method to these pervasive waves. They have extended the previously developed wave-tracking technique to the whole field of view, and obtained the global distribution of the wave phase speed. The intensity ratio of the two Fe XIII lines is sensitive to the electron density, thus has been used to derive the global map of coronal electron density. Combing the wave-tracking and density diagnostic results, they have successfully mapped the magnetic field in the global corona.</p> <p>This is the first time that a global map of the coronal magnetic field has been obtained through actual coronal observations, thus marking a leap towards solving the problem of coronal magnetic field measurements. In principle, with this technique, global coronal magnetic field maps could now be routinely obtained, filling in the missing part of the measurements of the Sun’s global magnetism. Together with simultaneously measured photospheric magnetograms, these synoptic coronal magnetograms will provide critical information to advance our understanding of the magnetic coupling between different atmospheric layers as well as the physical mechanisms responsible for solar eruptions and solar cycle.</p> <p>See write-ups in <a href="https://science.sciencemag.org/content/369/6504/694?fbclid=IwAR2YyJKy6Stn_8gVfGXOgeyR4MFiFUYs7n5Fpt3QKQ7abdorg_5RGHXJ4Ts">Science</a>, <a href="https://www.newscientist.com/article/2251150-maps-of-the-suns-corona-could-help-us-predict-dangerous-solar-storms/">New Scientist</a>, <a href="https://www.sciencenews.org/article/sun-first-map-solar-corona-magnetic-field">Science News</a></p> <div class="resources-main border-0"> <a href="/sites/default/files/2021-11/Global%20maps%20of%20the%20magnetic%20field%20in%20the%20solar%20corona.pdf" class="i-file-pdf--before" target="_blank">Global maps of the magnetic field in the solar corona</a> </div> </div> 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typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 18, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/seasonal-variations-small-scale-waves-observed-icon-mighti"><span class="field field--name-title field--type-string field--label-hidden">Seasonal Variations of Small-Scale Waves observed by ICON-MIGHTI</span> </a> </h3> </div> </div> </div> </div> </div> </div> </div> </div> <div class="block block-layout-builder block-field-blocknodearticlefield-story-date"> <div class="field field--name-field-story-date field--type-datetime field--label-above"> <div class="field__label">Date</div> <div class="field__item"><time datetime="2020-08-12T12:00:00Z" class="datetime">Wed, 08/12/2020 - 12:00</time> </div> </div> </div> </main> <aside class="layout__region layout__region--sidebar resources-wrapper d-print-none"> <div class="block block-layout-builder block-field-blocknodearticlefield-article-tags"> <div class="resources-wrapper d-print-none"> <div class="resources related mb-4"> <h2 class="p-2 px-md-3">Tags</h2> <div class="p-2 px-md-3 py-md-3"> <a href="/taxonomy/term/15" hreflang="en">Sarah Gibson</a>, <a href="/taxonomy/term/23" hreflang="en">Scott McIntosh</a>, <a href="/taxonomy/term/47" hreflang="en">Steven Tomczyk</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Tue, 23 Nov 2021 16:05:28 +0000 kolinski 101 at https://www2.hao.ucar.edu Thermal Properties of Coronal Cavities https://www2.hao.ucar.edu/news/publication-highlight/thermal-properties-coronal-cavities <span class="field field--name-title field--type-string field--label-hidden">Thermal Properties of Coronal Cavities</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/3" typeof="schema:Person" property="schema:name" datatype="">kolinski</span></span> <span class="field field--name-created field--type-created field--label-hidden">Thu, 11/18/2021 - 10:29</span> <div class="layout__region--twocol d-grid d-print-flex with-sidebar"> <div class="layout__region layout__region--main-top breadcrumb-wrapper mt-2"> <div class="block block-system block-system-breadcrumb-block"> <nav class="mb-2 d-print-none" role="navigation" aria-labelledby="system-breadcrumb"> <h2 id="system-breadcrumb" class="visually-hidden">Breadcrumb</h2> <ol class="breadcrumb"> <li class="breadcrumb-item"> <a href="/">Home</a> </li> <li class="breadcrumb-item"> <a href="/taxonomy/term/15">Sarah Gibson</a> </li> </ol> </nav> </div> </div> <main class="layout__region layout__region--main main-content-wrapper"> <div class="block block-layout-builder block-field-blocknodearticlefield-subtitle"> <p class="field field--name-field-subtitle field--type-string field--label-above mb-4 mt-n4">Publication Name: Astronomy and Astrophysics; First HAO Author&#039;s Name: Sarah Gibson</p> </div> <div class="block block-layout-builder block-extra-field-blocknodearticleauthor-and-created"> <div class="author_created row gx-0"> <div class="col"> <div class="fw-bold fs-6">Author:</div> <div class="author_created__name fs-6">kolinski</div> <div class="author_created__date text-gray-dark fs-6">Nov 18, 2021</div> </div> </div> </div> <div class="mt-3 mt-md-4 block block-layout-builder block-field-blocknodearticlefield-main-content"> <div class="field field--name-field-main-content field--type-entity-reference-revisions field--label-hidden field__items"> <div class="field__item"> <div class="paragraph paragraph--type--rich-text paragraph--view-mode--default"> <div class="clearfix text-formatted field field--name-field-body field--type-text-long field--label-hidden field__item"><p>We have analyzed 33 cavities observed between 2012 and 2018, from solar activity maximum to minimum. For each cavity we applied a differential emission measure method to obtain both a temperature distribution and a value of the average temperature.</p> <figure class="align-left media media--type-image media--view-mode-default figure mb-1 mb-md-4"> <p> <img src="/sites/default/files/styles/extra_large/public/2021-11/Gibson-CavitiesStreamers-results.png?itok=dOPpGWi_" width="926" height="636" alt="Average temperature of 35 cavities (black) and their surrounding streamers (red)" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>Average temperature of 35 cavities (black) and their surrounding streamers (red).</p> </figcaption> </figure> <p>We find that cavities are filled with material hotter than the surrounding streamer, with temperatures in the range of 1.67 - 2.15 MK. Differences between temperatures of cavities and surrounding streamers are in the range of 0.11 - 0.32 MK with an average value of 0.21 MK. We found that temperatures of both, cavities and streamers, vary as a function of different phases of solar activity. During solar maximum the structures are slightly hotter than those observed during solar minimum (1.85 - 2.15 MK vs. 1.67 - 1.88 MK for cavities and streamers, respectively).</p> <p>Link to paper: <a href="https://ui.adsabs.harvard.edu/abs/2019SoPh..294..164B/abstract">Thermal Properties of Coronal Cavities</a></p> </div> </div> </div> </div> </div> <div class="views-element-container block block-views block-views-blockarticles-recent-news"> <h2 class="mb-md-2">Recent News</h2> <div><div class="view view-articles view-id-articles view-display-id-recent_news js-view-dom-id-28d40212171ce1558db5a7a257fc6921e8b3f1fce008a0f17559b32ce2fda775"> <div class="view-content"> <div class="views-view-grid horizontal cols-3 col-12 mb-2 mb-md-4"> <div class="row row-cols-1 row-cols-sm-2 row-cols-md-3 g-2 g-md-4 row-1"> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a 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href="/news/publication-highlight/lagrangian-study-tidal-advection-mesospheric-water-vapor" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Pedatella_DW1advectedH2O.png?itok=QXmqdjt2" width="479" height="480" alt="DW1 advected H2O volume mixing ratio" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 19, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/lagrangian-study-tidal-advection-mesospheric-water-vapor"><span class="field field--name-title field--type-string field--label-hidden">A Lagrangian Study of Tidal Advection of Mesospheric Water Vapor</span> </a> </h3> </div> </div> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/coronal-cavities-comp-observations" hreflang="en"><img 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field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/seasonal-variations-small-scale-waves-observed-icon-mighti" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Maute_perturbationAmplitudes.jpg?itok=BRSLJoPb" width="480" height="326" alt="Seasonal variations of monthly-zonal-mean small-scale perturbation amplitudes" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 18, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/seasonal-variations-small-scale-waves-observed-icon-mighti"><span class="field field--name-title field--type-string field--label-hidden">Seasonal Variations of Small-Scale Waves observed by ICON-MIGHTI</span> </a> </h3> </div> </div> </div> </div> </div> </div> </div> </div> <div class="block block-layout-builder block-field-blocknodearticlefield-story-date"> <div class="field field--name-field-story-date field--type-datetime field--label-above"> <div class="field__label">Date</div> <div class="field__item"><time datetime="2020-03-31T12:00:00Z" class="datetime">Tue, 03/31/2020 - 12:00</time> </div> </div> </div> </main> <aside class="layout__region layout__region--sidebar resources-wrapper d-print-none"> <div class="block block-layout-builder block-field-blocknodearticlefield-article-tags"> <div class="resources-wrapper d-print-none"> <div class="resources related mb-4"> <h2 class="p-2 px-md-3">Tags</h2> <div class="p-2 px-md-3 py-md-3"> <a href="/taxonomy/term/15" hreflang="en">Sarah Gibson</a>, <a href="/taxonomy/term/3" hreflang="en">corona</a>, <a href="/taxonomy/term/60" hreflang="en">solar cycle</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Thu, 18 Nov 2021 17:29:30 +0000 kolinski 72 at https://www2.hao.ucar.edu Reconstructing the Coronal Magnetic Field: The Role of Cross-Field Currents in Solution Uniqueness https://www2.hao.ucar.edu/news/publication-highlight/reconstructing-coronal-magnetic-field-role-cross-field-currents-solution <span class="field field--name-title field--type-string field--label-hidden">Reconstructing the Coronal Magnetic Field: The Role of Cross-Field Currents in Solution Uniqueness</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/3" typeof="schema:Person" property="schema:name" datatype="">kolinski</span></span> <span class="field field--name-created field--type-created field--label-hidden">Tue, 11/16/2021 - 15:15</span> <div class="layout__region--twocol d-grid d-print-flex with-sidebar"> <div class="layout__region layout__region--main-top breadcrumb-wrapper mt-2"> <div class="block block-system block-system-breadcrumb-block"> <nav class="mb-2 d-print-none" role="navigation" aria-labelledby="system-breadcrumb"> <h2 id="system-breadcrumb" class="visually-hidden">Breadcrumb</h2> <ol class="breadcrumb"> <li class="breadcrumb-item"> <a href="/">Home</a> </li> <li class="breadcrumb-item"> <a href="/taxonomy/term/15">Sarah Gibson</a> </li> </ol> </nav> </div> </div> <main class="layout__region layout__region--main main-content-wrapper"> <div class="block block-layout-builder block-field-blocknodearticlefield-subtitle"> <p class="field field--name-field-subtitle field--type-string field--label-above mb-4 mt-n4">Publication: Astrophysical Journal; First HAO Author: Sarah Gibson</p> </div> <div class="block block-layout-builder block-extra-field-blocknodearticleauthor-and-created"> <div class="author_created row gx-0"> <div class="col"> <div class="fw-bold fs-6">Author:</div> <div class="author_created__name fs-6">kolinski</div> <div class="author_created__date text-gray-dark fs-6">Nov 16, 2021</div> </div> </div> </div> <div class="mt-3 mt-md-4 block block-layout-builder block-field-blocknodearticlefield-main-content"> <div class="field field--name-field-main-content field--type-entity-reference-revisions field--label-hidden field__items"> <div class="field__item"> <div class="paragraph paragraph--type--rich-text paragraph--view-mode--default"> <div class="clearfix text-formatted field field--name-field-body field--type-text-long field--label-hidden field__item"><p>We present a new 3D magnetohydrostatic (MHS) direct elliptic solver for extrapolating the coronal magnetic field from photospheric boundary conditions in a manner consistent with an assumed plasma distribution. We use it to study the uniqueness of the reconstructed magnetic field as a function of how significant the plasma forcing is on the force balance of the magnetic field.</p> <figure class="align-left media media--type-image media--view-mode-default figure mb-1 mb-md-4"> <p> <img src="/sites/default/files/styles/extra_large/public/2021-11/Gibson_nathaniel.png?itok=YJ5_A4Lr" width="926" height="710" alt="Comparison of analytic model magnetic field lines to results of numerical reconstruction" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>Comparison of analytic model magnetic field lines to results of numerical reconstruction. Despite containing more currents, the reconstruction shown on the bottom row is closer to ground truth than the top. The implication is that cross-field currents (characterized by parameter a) enable the solver to converge to a unique solution.</p> </figcaption> </figure> <p>To this end, we consider an analytic MHS model as ground truth. The model uses two free parameters to decompose the current into two parts: a magnetic-field aligned component and a cross-field component. We perform a comprehensive study of the 2D parameter space to understand under what conditions the ground truth can be reproduced uniquely. From this we conclude that a significant cross-field current and associated plasma distribution results in a nearly one-to-one relationship between the photospheric boundary and the atmospheric magnetic field in force balance with that plasma distribution, enabling the solver to converge to a unique solution.</p> <p>Link to paper: <a href="https://ui.adsabs.harvard.edu/abs/2020ApJ...898...70M/abstract">Reconstructing the Coronal Magnetic Field: The Role of Cross-field Currents in Solution Uniqueness</a></p> </div> </div> </div> </div> </div> <div class="views-element-container block block-views block-views-blockarticles-recent-news"> <h2 class="mb-md-2">Recent News</h2> <div><div class="view view-articles view-id-articles view-display-id-recent_news js-view-dom-id-a8145b9a25ce3bf15dfa7af5c01566fb52b944c559628435e0759c3f327fcc9a"> <div class="view-content"> <div class="views-view-grid horizontal cols-3 col-12 mb-2 mb-md-4"> <div class="row row-cols-1 row-cols-sm-2 row-cols-md-3 g-2 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</div> </div> </div> </div> </div> <div class="block block-layout-builder block-field-blocknodearticlefield-story-date"> <div class="field field--name-field-story-date field--type-datetime field--label-above"> <div class="field__label">Date</div> <div class="field__item"><time datetime="2020-10-23T12:00:00Z" class="datetime">Fri, 10/23/2020 - 12:00</time> </div> </div> </div> </main> <aside class="layout__region layout__region--sidebar resources-wrapper d-print-none"> <div class="block block-layout-builder block-field-blocknodearticlefield-article-tags"> <div class="resources-wrapper d-print-none"> <div class="resources related mb-4"> <h2 class="p-2 px-md-3">Tags</h2> <div class="p-2 px-md-3 py-md-3"> <a href="/taxonomy/term/15" hreflang="en">Sarah Gibson</a>, <a href="/taxonomy/term/3" hreflang="en">corona</a>, <a href="/taxonomy/term/14" hreflang="en">solar magnetism</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Tue, 16 Nov 2021 22:15:12 +0000 kolinski 45 at https://www2.hao.ucar.edu