Rebecca Centeno https://www2.hao.ucar.edu/ en Effects of spectral resolution on simple magnetic field diagnostics of the Mg II h & k lines https://www2.hao.ucar.edu/news/publication-highlight/effects-spectral-resolution-simple-magnetic-field-diagnostics-mg-ii-h-k <span class="field field--name-title field--type-string field--label-hidden">Effects of spectral resolution on simple magnetic field diagnostics of the Mg II h &amp; k lines</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">Fri, 09/23/2022 - 15:17</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/66">Rebecca Centeno</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 23, 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>The Astrophysical Journal: </em><strong>Rebecca Centeno</strong>, <strong>Matthias Rempel</strong>, <strong>Roberto Casini</strong>, and Tanausu del Pino Aleman study the effects of finite spectral resolution on the magnetic field values retrieved through the weak field approximation (WFA) from the cores of the Mg II h&amp;k lines. The retrieval of the line-of-sight (LOS) component of the magnetic field, Blos, from synthetic spectra generated in a uniformly magnetized FAL-C atmosphere are accurate when restricted to the inner lobes of Stokes V. As we degrade the spectral resolution, partial redistribution (PRD) effects that more prominently affect the outer lobes of Stokes V, are brought into the line core through spectral smearing, degrading the accuracy of the WFA and resulting in an inference bias, which is more pronounced the poorer the resolution. When applied to a diverse set of spectra emerging from a sunspot simulation, we find a good accuracy in the retrieved Blos when comparing it to the model value at the height where the optical depth in the line core is unity. The accuracy is preserved up to field strengths of B~1700 G. Limited spectral resolution results in a bias toward weaker retrieved fields. The WFA for the transverse component of the magnetic field is also evaluated. We find the best estimates when the WFA is evaluated in the core of the line. Reduced spectral resolution degrades the accuracy of the inferences because spectral mixing results in the line effectively probing deeper layers of the atmosphere. </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/2022-09/Centeno_scatteredDensityPlots.png?itok=mZupYFhM" width="926" height="273" alt="3 Scatter density plots of the retrieved value of Blos" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>Scatter density plots of the retrieved value of Blos retrieved from Mg II h using the weak field approximation, against their MURaM model counterparts for the case of infinite spectral resolution (left), R = 45,000h (middle) and R = 30,000 (right). The model values are taken at the height where the core of the Mg II h line reaches optical depth unity. The darker the grey-level, the higher the number of samples in the bin. The bin size is 40 G. The red line represents the ideal solution and the blue line shows a linear fit through the data.</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-ef821317b8d364c816ec91f706dd6909288a3ab260741899232627a880f8fa55"> <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 November 2022 eruption" 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 29, 2022</div> <h3 class="card-title"> <a href="/news/news-article/hawaiis-mauna-loa-erupts-after-38-years-mauna-loa-solar-observatory-temporarily"><span class="field field--name-title field--type-string field--label-hidden">Hawaii&#039;s Mauna Loa Erupts after 38 years; Mauna Loa Solar Observatory temporarily closed</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/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="2022-06-21T12:00:00Z" class="datetime">Tue, 06/21/2022 - 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/66" hreflang="en">Rebecca Centeno</a>, <a href="/taxonomy/term/39" hreflang="en">Roberto Casini</a>, <a href="/taxonomy/term/13" hreflang="en">modeling</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Fri, 23 Sep 2022 21:17:25 +0000 whawkins 706 at https://www2.hao.ucar.edu 2nd Successful Spectropolarimetry School https://www2.hao.ucar.edu/news/news-article/2nd-successful-spectropolarimetry-school <span class="field field--name-title field--type-string field--label-hidden">2nd Successful Spectropolarimetry School</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, 09/07/2022 - 09:36</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/66">Rebecca Centeno</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">2022 Spectropolarimetry School</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">whawkins</div> <div class="author_created__date text-gray-dark fs-6">Sep 7, 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>The High Altitude Observatory and the National Solar Observatory organized their second successful Spectropolarimetry School in Boulder, Colorado. This two-week school held at the end of August presented an overview of the field of solar spectropolarimetry and the diagnostic techniques used to analyze and interpret spectropolarimetric observations of the Sun.</p> <p>Solar magnetism is at the root of all solar activity and is the driving force of Space Weather. The characteristics of the magnetic field are encoded in the polarization of the light emitted by the Sun, and sensitive analysis techniques are necessary to reveal them. This school explored the observations, the theory and the tools that help us determine the state and evolution of the Sun's magnetic field through its polarized spectrum. The curriculum covered theoretical topics such as polarized radiative transfer, polarimetric instrumentation, scattering polarization and the Hanle effect, as well as dozens of hours of hands-on tutorials with different spectral line inversion codes. The school brought together 19 domestic and 7 international participants as well as multiple leading experts from around the world.</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/2022-09/HelioSchoolGroupPhoto.jpg?itok=iesSSX9w" width="926" height="546" alt="Smiling group of Spectropolarimetry school students and lecturers taken on the outdoor patio at Center Green 1 building." loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>Group portrait of the 2022 Spectropolarimetry school students and lecturers taken on the outdoor patio at Center Green 1 building.</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-caccbd70409223f0f2f976e92191098ba0fcaba737feb5ee5bc6c16a5ddea409"> <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 November 2022 eruption" 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 29, 2022</div> <h3 class="card-title"> <a href="/news/news-article/hawaiis-mauna-loa-erupts-after-38-years-mauna-loa-solar-observatory-temporarily"><span class="field field--name-title field--type-string field--label-hidden">Hawaii&#039;s Mauna Loa Erupts after 38 years; Mauna Loa Solar Observatory temporarily closed</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/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/66" hreflang="en">Rebecca Centeno</a>, <a href="/taxonomy/term/41" hreflang="en">spectropolarimetry</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Wed, 07 Sep 2022 15:36:21 +0000 whawkins 696 at https://www2.hao.ucar.edu On the (Mis)interpretation of the Scattering Polarization Signatures In the Ca II 8542 A line Through Spectral Line Inversions https://www2.hao.ucar.edu/news/publication-highlight/misinterpretation-scattering-polarization-signatures-ca-ii-8542-line <span class="field field--name-title field--type-string field--label-hidden">On the (Mis)interpretation of the Scattering Polarization Signatures In the Ca II 8542 A line Through Spectral Line Inversions</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">Mon, 07/11/2022 - 14:45</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/66">Rebecca Centeno</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: The Astrophysical Journal; Author&#039;s names: Centeno, R., de la Cruz Rodriguez, J., del Pino Aleman, T.</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">Jul 11, 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>Scattering polarization tends to dominate the linear polarization signals of the Ca II 8542 A line in weakly magnetized areas (B ~ 100 G), especially when the observing geometry is close to the limb. In this paper we evaluate the degree of applicability of existing non-LTE spectral line inversion codes (which assume that the spectral line polarization is due to the Zeeman effect only) at inferring the magnetic field vector and, particularly, its transverse component. To this end, we use the inversion code STiC to extract the strength and orientation of the magnetic field from synthetic spectropolarimetric data generated with the Hanle-RT code. The latter accounts for the generation of polarization through scattering processes as well as the joint actions of the Hanle and the Zeeman effects. We find that, when the transverse component of the field is stronger than ~80 G, the inversion code is able to retrieve accurate estimates of the transverse field strength as well as its azimuth in the plane of the sky. Below this threshold, the scattering polarization signatures become the major contributors to the linear polarization signals and often mislead the inversion code into severely over- or under-estimating the field strength. Since the line-of-sight component of the field is derived from the circular polarization signal, which is not affected by atomic alignment, the corresponding inferences are always good.</p> <figure class="align-center media media--type-image media--view-mode-default figure mb-1 mb-md-4"> <p> <img src="/sites/default/files/styles/extra_large/public/2022-07/Centeno-inversion-results.png?itok=yGxsZGQQ" width="926" height="668" alt="Inversion results for observing geometries away from the disk center" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>Inversion results for observing geometries away from the disk center. The panels show the relative (percent) differences between the magnetic field values retrieved by the STiC inversions and those in the model atmospheres used for the Hanle-RT syntheses. Left and right correspond, respectively, to the Zeeman-only and the full calculation with atomic polarization cases. The top two rows show the results for the strength and the azimuth of the transverse component of the magnetic field, while the bottom panels present the results for the LOS magnetic field.</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-cc80b98a7482afe9638fdc0111639d43b1cfc92313a30181ffa0c22970dce4e5"> <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 November 2022 eruption" 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 29, 2022</div> <h3 class="card-title"> <a href="/news/news-article/hawaiis-mauna-loa-erupts-after-38-years-mauna-loa-solar-observatory-temporarily"><span class="field field--name-title field--type-string field--label-hidden">Hawaii&#039;s Mauna Loa Erupts after 38 years; Mauna Loa Solar Observatory temporarily closed</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/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="2022-06-17T12:00:00Z" class="datetime">Fri, 06/17/2022 - 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/66" hreflang="en">Rebecca Centeno</a>, <a href="/taxonomy/term/14" hreflang="en">solar magnetism</a>, <a href="/taxonomy/term/41" hreflang="en">spectropolarimetry</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Mon, 11 Jul 2022 20:45:28 +0000 kolinski 597 at https://www2.hao.ucar.edu AAS Nova Features a Recent Publication by Philip Judge https://www2.hao.ucar.edu/news/news-article/aas-nova-features-recent-publication-philip-judge <span class="field field--name-title field--type-string field--label-hidden">AAS Nova Features a Recent Publication by Philip Judge</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 - 12:36</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/66">Rebecca Centeno</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 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>Understanding the magnitude and occurrence of solar storms is key to predicting events that can be harmful to thousands of Earth-orbiting satellites and the welfare of astronauts. A recent paper by Philip Judge et al was highlighted in AAS Nova in a their featured article entitled, "<em><a href="https://aasnova.org/2021/09/29/a-better-space-weather-forecasting-tool/">A Better Space Weather Forecasting Tool</a></em>."</p> <figure class="align-center 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/judge_2021_Figure2.png?itok=2Bpr8xPv" width="926" height="511" alt="Images to highlight the corrugated surfaces at which the centers of UV lines are formed (close to τ = 1) in MURaM calculations of the upper solar chromosphere" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>Images to highlight the corrugated surfaces at which the centers of UV lines are formed (close to τ = 1) in MURaM calculations of the upper solar chromosphere. The calculations are from a numerical experiment where a magnetic flux system is emerging from beneath the solar atmosphere. The emergent fields carry with them plasma, which is revealed by the extended heights of the τ = 1 surfaces, which can exceed 10 Mm. Typically the Doppler line shifts in the lower transition region are smaller than the line widths (Athay &amp; Dere 1991). Therefore the τ = 1 surfaces were computed without taking into account Doppler shifts, at the centers of lines of Mg ii k, and several lines of Fe ii. The x–y images of height of formation are plotted in order of decreasing opacity from Mg ii to Fe ii 2769.75 Å. In the bottom right panel, slices of these τ = 1 surfaces are shown, taken along the black line in the five other panels. But the black lines in this final panel are magnetic lines of force in the y–z plane. Evidently, a combination of these and other lines of iron with a wide range of opacities spans the ranges of excursions of the surfaces away from a horizontal plane.</p> </figcaption> </figure> <p>Link to paper: <em><a href="https://iopscience.iop.org/article/10.3847/1538-4357/ac081f/meta">Measuring the Magnetic Origins of Solar Flares, Coronal Mass Ejections, and Space Weather</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-d5f623a6c24e7d04fe3cfcde68da738ef2c04ab58d9293a5ce8a46073e6668f9"> <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 November 2022 eruption" 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 29, 2022</div> <h3 class="card-title"> <a href="/news/news-article/hawaiis-mauna-loa-erupts-after-38-years-mauna-loa-solar-observatory-temporarily"><span class="field field--name-title field--type-string field--label-hidden">Hawaii&#039;s Mauna Loa Erupts after 38 years; Mauna Loa Solar Observatory temporarily closed</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/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="2021-10-01T12:00:00Z" class="datetime">Fri, 10/01/2021 - 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/65" hreflang="en">Joan Burkepile</a>, <a href="/taxonomy/term/45" hreflang="en">Matthias Rempel</a>, <a href="/taxonomy/term/44" hreflang="en">Paul Bryans</a>, <a href="/taxonomy/term/10" hreflang="en">Phil Judge</a>, <a href="/taxonomy/term/66" hreflang="en">Rebecca Centeno</a>, <a href="/taxonomy/term/36" hreflang="en">solar flare</a>, <a href="/taxonomy/term/62" hreflang="en">space weather</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Thu, 18 Nov 2021 19:36:28 +0000 kolinski 86 at https://www2.hao.ucar.edu