Earth&#039;s upper atmosphere https://www2.hao.ucar.edu/ en The effects of IMF By on the middle thermosphere during a geomagnetically “quiet” period at solar minimum https://www2.hao.ucar.edu/news/publication-highlight/effects-imf-middle-thermosphere-during-geomagnetically-quiet-period <span class="field field--name-title field--type-string field--label-hidden">The effects of IMF By on the middle thermosphere during a geomagnetically “quiet” period at solar minimum</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 - 15:02</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/7">Earth's upper atmosphere</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: JR Space Physics; Authors: Xuguang Cai, Wenbin Wang, Alan Burns, Liying Qian, Richard W. Eastes</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"><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/2022-07/Cai_nfig1.png?itok=jUK_Zur4" width="926" height="405" alt="The polar view of the percentage difference of simulated ∑O/N2 and GOLD observed ∑O/N2 between DOY 111 and 110 at 15:10 UT in 2019. The perimeter latitude is 30°N" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>The polar view of the percentage difference of simulated ∑O/N2 and GOLD observed ∑O/N2 between DOY 111 and 110 at 15:10 UT in 2019. The perimeter latitude is 30°N</p> </figcaption> </figure> <p>Numerical simulations using the National Center for Atmospheric Research (NCAR) thermosphere-ionosphere-electrodynamics general circulation model (TIE-GCM) are performed to elucidate the effects of the interplanetary magnetic field (IMF) on the middle thermosphere composition during a “geomagnetically quiet” period from the day of year (DOY) 110-111 in 2019 (when the Auroral electrojet (AE) index never exceeded 300 nT and the Kp never exceeded 2). In particular, this paper aims to examine how the Global-scale Observations of the Limb and Disk (GOLD) mission observed daytime thermospheric O and N2 column density ratio (∑O/N2) depletion at mid-latitudes originated under such a “geomagnetically quiet” condition. A comparison of electric potential, Joule heating rate per unit mass, ion velocity, neutral temperature and winds in the middle thermosphere (∼160 km) between real IMF and without the IMF east-west component (By) indicates that a By dominant condition can enhance their strengths under this “geomagnetically quiet” condition. Consequently, ∑O/N2 depletion with a stronger magnitude (30% compared with ∼8% without By) and larger disturbed area was introduced in the post-midnight sector at high-latitudes due to strong and localized upwelling associated with the enhanced Joule heating rate per unit mass. The ∑O/N2 depletion was transported equatorward and corotated from local post-midnight to early morning, and was observed by GOLD at middle latitudes during daytime.</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-c94128f46b9dcd9ab207d3a91cf6e9db079d5eb83ea9b1f9cc215af5deb3d165"> <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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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="2022-05-05T12:00:00Z" class="datetime">Thu, 05/05/2022 - 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/31" hreflang="en">Alan Burns</a>, <a href="/taxonomy/term/27" hreflang="en">Liying Qian</a>, <a href="/taxonomy/term/9" hreflang="en">Wenbin Wang</a>, <a href="/taxonomy/term/38" hreflang="en">Xuguang Cai</a>, <a href="/taxonomy/term/7" hreflang="en">Earth&#039;s upper atmosphere</a>, <a href="/taxonomy/term/37" hreflang="en">GOLD</a>, <a href="/taxonomy/term/13" hreflang="en">modeling</a>, <a href="/taxonomy/term/25" hreflang="en">TIEGCM</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Mon, 11 Jul 2022 21:02:35 +0000 kolinski 599 at https://www2.hao.ucar.edu The Molecular Oxygen Density Structure of the Lower Thermosphere as Seen by GOLD and Models https://www2.hao.ucar.edu/news/publication-highlight/molecular-oxygen-density-structure-lower-thermosphere-seen-gold-and <span class="field field--name-title field--type-string field--label-hidden">The Molecular Oxygen Density Structure of the Lower Thermosphere as Seen by GOLD and Models</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 - 14:39</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/7">Earth's upper atmosphere</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: Geophysics Research Letters; Author&#039;s: K. R. Greer, F. Laskar, R. Eastes, J. Lumpe, H.-L. Liu, and N. Pedatella</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"><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/2022-07/Liu_localTimeStructure.png?itok=asZ0o_sL" width="926" height="695" alt="Comparisons of local time structure of molecular oxygen at 21°N, 170 km altitude" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>Comparisons of local time structure of molecular oxygen at 21°N, 170 km altitude. Red dots are for the longitude of 33°E, while blue dots are for the longitude of 128°W. Panel (a) shows molecular oxygen densities as observed by the GOLD instrument for one star, HD74280, between January 2019 and July 2021. Panel (b) are results from the MSISE-00 empirical model sampled for the same locations and conditions as the GOLD observations. Panel (c) is as panel (b) but for the MSIS2.0 empirical model. Panel (d) shows the SD-WACCM-X model sampled for the GOLD observations. The observations show a distinctly diurnal structure in local time, while all the model results indicate a semidiurnal structure.</p> </figcaption> </figure> <p>This paper compares new observations from the Global-scale Observations of Limb and Disk (GOLD) mission of molecular oxygen (O2) in the lower thermosphere (130 - 200 km in altitude) to widely used models in the aeronomy community. The main finding is that the local time structure of the observed molecular oxygen has a minimum at 6 hours local time and a peak near 18 hours local time while the models all show a structure that has peaks at both 6 and 18 hours local time. This significant difference not only influences the total neutral thermospheric density results from the models, but may ultimately impact the calculated ionospheric plasma density and its temporal variability. Understanding ionospheric plasma densities is vital for the proper modeling of the propagation of communications and navigational signals.</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-be0a4db4843fde522780d5851d0fedb3277269de8686a1db76b762c9b22d8c42"> <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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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 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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/30" hreflang="en">Hanli Liu</a>, <a href="/taxonomy/term/103" hreflang="en">Katelynn Greer</a>, <a href="/taxonomy/term/16" hreflang="en">Nick Pedatella</a>, <a href="/taxonomy/term/7" hreflang="en">Earth&#039;s upper atmosphere</a>, <a href="/taxonomy/term/37" hreflang="en">GOLD</a>, <a href="/taxonomy/term/13" hreflang="en">modeling</a>, <a href="/taxonomy/term/35" hreflang="en">Sun-Earth connection</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Mon, 11 Jul 2022 20:39:20 +0000 kolinski 596 at https://www2.hao.ucar.edu Impacts of Different Causes on the Inter–Hemispheric Asymmetry of Ionosphere–Thermosphere System at Mid– and High–Latitudes: GITM Simulations https://www2.hao.ucar.edu/news/publication-highlight/impacts-different-causes-inter-hemispheric-asymmetry-ionosphere <span class="field field--name-title field--type-string field--label-hidden">Impacts of Different Causes on the Inter–Hemispheric Asymmetry of Ionosphere–Thermosphere System at Mid– and High–Latitudes: GITM Simulations</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, 04/04/2022 - 12:49</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/7">Earth's upper atmosphere</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: Space Weather; Authors: Yu Hong, Yue Deng, Qingyu Zhu, Astrid Maute, Cheng Sheng, Daniel Welling, Ramon Lopez</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">Apr 4, 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-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/2022-04/Maute_InterhemisphericDifferencesPoleward.png?itok=qymLtumz" width="926" height="420" alt="Interhemispheric differences poleward of 40deg geog. latitude of E-region electron density" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>Interhemispheric differences poleward of 40deg geog. latitude of E-region electron density (a), F-region neutral density (b) and neutral wind (c), and height integrated Joule heating (d) with symmetric magnetic field (aligned dipole- top) and realistic Earth's magnetic field (IGRF- bottom).</p> </figcaption> </figure> <p>There are significant differences between the Earth’s two hemispheres such as the Earth's magnetic field and the intensity of solar radiation due to Earth's tilt of the rotation axis with respect to the Sun. Understanding the impact and therefore the importance of these asymmetries on the mid- and high-latitude upper atmosphere is a challenge in the geospace community. The main contributions to these asymmetries include among others: (1) the displacement between Earth’s magnetic poles and geographic poles, (2) the seasonal solar EUV irradiation, and (3) the magnetospheric forcing, including the electric field and the auroral particle precipitation. However, it is still unclear to what extent the ionosphere-thermosphere (I-T) quantities such as the electron density can be affected by these asymmetric causes. In this study, the asymmetric contributions of the above causes on I-T quantities have been estimated through comparisons of numerical experiments using the Global Ionosphere and Thermosphere Model (GITM). It is found that season plays a dominant role in causing hemispheric asymmetries in all the examined quantities; our results also suggest that the contributions of the asymmetric magnetospheric forcing could be even more important during intense storms than the other causes shown in this work.</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-45519254a11b89cbd752e95b02737e2401f3d8d56ba31a6d57ffecfd1b49c4b5"> <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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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="2022-03-31T12:00:00Z" class="datetime">Thu, 03/31/2022 - 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/8" hreflang="en">Astrid Maute</a>, <a href="/taxonomy/term/7" hreflang="en">Earth&#039;s upper atmosphere</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Mon, 04 Apr 2022 18:49:10 +0000 kolinski 451 at https://www2.hao.ucar.edu Impact of Thermospheric Wind Data Assimilation on Ionospheric Electrodynamics using a Coupled Whole Atmosphere Data Assimilation System https://www2.hao.ucar.edu/news/publication-highlight/impact-thermospheric-wind-data-assimilation-ionospheric-electrodynamics <span class="field field--name-title field--type-string field--label-hidden">Impact of Thermospheric Wind Data Assimilation on Ionospheric Electrodynamics using a Coupled Whole Atmosphere Data Assimilation System</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, 03/03/2022 - 14:39</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/7">Earth's upper atmosphere</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: Journal of Geophysical Research, Space Physics; Authors: Chih-Ting Hsu, Nick Pedatella, Jeff Anderson</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">Mar 3, 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/2022-03/Hsu_Three%20Observing%20System%20Simulation%20Experiments%20%28OSSEs%29.jpg?itok=oru5jfrw" width="926" height="899" alt="Longitude-latitude maps of NmF2 from the NR (first column) and the difference of NmF2 between OSSEs and NR (second to fourth columns) at six different times." loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>Three Observing System Simulation Experiments (OSSEs) are carried out in this study. Thermospheric wind and temperature states are updated using synthetic data sampled from a Nature Run (NR) in this experiment. The updated thermospheric states will further change the plasma drift and electron density in the ionosphere. This figure shows the longitude-latitude maps of NmF2 from the NR (first column) and the difference of NmF2 between OSSEs and NR (second to fourth columns) at six different times. From top to bottom rows are maps at 1200 UT on 05, 10, 15, 20, 25, and 30 December 2009. From the second to fourth columns are the difference of NmF2 between OSSE-MIGHTI-ELF, OSSE-MIGHTI-GC, and OSSE-GC and NR.</p> </figcaption> </figure> <p>The upward plasma drift and equatorial ionization anomaly (EIA) in the Earth's ionosphere are strongly influenced by the zonal electric field, which is generated by the wind dynamo. Specification and forecasting of thermospheric winds thus plays an important role in ionospheric weather prediction. In this study, we assess the impact of assimilating thermospheric wind observations from the Michelson Interferometer for Global High-resolution Thermospheric Imaging (MIGHTI) instrument on NASA's Ionospheric CONnection (ICON) explorer satellite on the ionospheric electrodynamics. Empirical Localization Functions (ELFs) of ICON/MIGHTI zonal and meridional winds are also computed and applied to our data assimilation experiments, enabling improved assimilation of the ICON/MIGHTI wind observations. A set of Observing System Simulation Experiments (OSSEs) are performed using the National Center for Atmospheric Research (NCAR) Whole Atmosphere Community Climate Model with thermosphere-ionosphere eXtension (WACCMX) with data assimilation provided by the Data Assimilation Research Testbed (DART) ensemble adjustment Kalman filter. The results show that assimilating the ICON/MIGHTI wind observations with the ELF improves the zonal and meridional wind root mean square error (RMSE) by 16-18% and 7-10%, respectively. The improved wind specification further improves the low-latitude ExB vertical drift RMSE by about 18%. The response of electron densities is slower, and the overall impact is smaller. The improvement of the ionosphere F-region maximum electron density (NmF2) between -45 to 45 degree is about 8% after 18 days of data assimilation.</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-2b935f6cb50fe3e5c8be6c9ac0a84974f78e9700711363405e6b3958d80b409c"> <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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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="2022-03-01T12:00:00Z" class="datetime">Tue, 03/01/2022 - 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/20" hreflang="en">Chih-Ting Hsu</a>, <a href="/taxonomy/term/16" hreflang="en">Nick Pedatella</a>, <a href="/taxonomy/term/7" hreflang="en">Earth&#039;s upper atmosphere</a>, <a href="/taxonomy/term/35" hreflang="en">Sun-Earth connection</a>, <a href="/taxonomy/term/17" hreflang="en">WACCM</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Thu, 03 Mar 2022 21:39:21 +0000 kolinski 414 at https://www2.hao.ucar.edu HAO affiliate scientist, Dr. Joe Huba, published in a popular-science journal https://www2.hao.ucar.edu/news/news-article/hao-affiliate-scientist-dr-joe-huba-published-popular-science-journal <span class="field field--name-title field--type-string field--label-hidden">HAO affiliate scientist, Dr. Joe Huba, published in a popular-science journal</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 - 11:40</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/7">Earth's upper atmosphere</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>Dr. Joe Huba is a Senior Research Scientist at Syntek Technologies in Virginia and a long-standing Affiliate Scientist at HAO. In a Scientia article, he explores the complex process of vast plasma bubbles forming in the upper atmosphere and quickly ascending into space.</p> <p>See full article:&nbsp;<a href="https://www.scientia.global/dr-joe-huba-plasma-bubbles-after-sunset-simulating-instabilities-in-the-ionosphere/">Plasma Bubbles after Sunset: Simulating Instabilities in the Ionosphere</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-e7c12b26a49ee8e428685edf26e254fb2142f97cf1b5ce4a61340f28c6c58f31"> <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 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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="2020-07-23T12:00:00Z" class="datetime">Thu, 07/23/2020 - 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/73" hreflang="en">Joe Huba</a>, <a href="/taxonomy/term/7" hreflang="en">Earth&#039;s upper atmosphere</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Tue, 23 Nov 2021 18:40:25 +0000 kolinski 102 at https://www2.hao.ucar.edu Space Storms in the Upper Atmosphere and Ionosphere https://www2.hao.ucar.edu/news/news-article/space-storms-upper-atmosphere-and-ionosphere <span class="field field--name-title field--type-string field--label-hidden">Space Storms in the Upper Atmosphere and Ionosphere</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, 11/22/2021 - 11:42</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/7">Earth's upper atmosphere</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 22, 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"><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/StanSolomon.jpg?itok=6vu5MAzs" width="926" height="931" alt="Stan Solomon" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>Stan Solomon</p> </figcaption> </figure> <p>Stan Solomon presented a NCAR Explorer Series lecture about how the aurora is formed and varies with the solar wind driver. In this public outreach lecture Stan delves into the physics and chemistry of the ionosphere.</p> <p>Stan's lecture: <em><a href="https://ncar.ucar.edu/what-we-offer/education-outreach/public/ncar-explorer-series-lectures/space-storms">NCAR Explorer Series Lecture by Stan Solomon</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-0a981dd77dfcde2ef93608fec7b5add241825517accb5c46c12d03a1a9ba8202"> <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="2020-12-01T12:00:00Z" class="datetime">Tue, 12/01/2020 - 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/29" hreflang="en">Stan Solomon</a>, <a href="/taxonomy/term/7" hreflang="en">Earth&#039;s upper atmosphere</a>, <a href="/taxonomy/term/5" hreflang="en">solar wind</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Mon, 22 Nov 2021 18:42:26 +0000 kolinski 98 at https://www2.hao.ucar.edu HIWIND Prepares for a New Zealand Flight in 2022 https://www2.hao.ucar.edu/news/news-article/hiwind-prepares-new-zealand-flight-2022 <span class="field field--name-title field--type-string field--label-hidden">HIWIND Prepares for a New Zealand Flight in 2022</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 - 14:06</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/7">Earth's upper atmosphere</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>Project scientist, Qian Wu and the HAO engineering team are busy at CG1 1st lab preparing for the HiWIND New Zealand flight anticipated for year 2022.</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/Wu_HiWindLabSetUp.png?itok=Vc7e26Sa" width="926" height="749" alt="HiWIND CG1 1st lab setup for New Zealand flight mission" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>HiWIND CG1 1st lab setup for New Zealand flight mission.</p> </figcaption> </figure> <p>For the first time since the HiWIND 2018 flight, the computer was initiated and the team verified that cables, etc. were in tip-top working condition. The connectivity of all the wiring and connector repairs were performed when necessary. This was an important milestone for the HiWIND reflight scientific mission.</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-2b2ee4fbf0a8328b3be695d0e2fc5c922bc2ec927a2088e63286f2b965e179aa"> <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 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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 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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="2021-06-23T12:00:00Z" class="datetime">Wed, 06/23/2021 - 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/18" hreflang="en">Qian Wu</a>, <a href="/taxonomy/term/7" hreflang="en">Earth&#039;s upper atmosphere</a>, <a href="/taxonomy/term/67" hreflang="en">HiWind</a>, <a href="/taxonomy/term/42" hreflang="en">instrumentation</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Thu, 18 Nov 2021 21:06:13 +0000 kolinski 88 at https://www2.hao.ucar.edu Interhemispheric Coupling Mechanisms in the Middle Atmosphere of WACCM6 https://www2.hao.ucar.edu/news/publication-highlight/interhemispheric-coupling-mechanisms-middle-atmosphere-waccm6 <span class="field field--name-title field--type-string field--label-hidden">Interhemispheric Coupling Mechanisms in the Middle Atmosphere of WACCM6</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 - 12:30</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/7">Earth's upper atmosphere</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: Journal of Atmospheric Sciences; First HAO Author&#039;s Name: Nick Pedatella</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>Simulations with the Community Earth System Model 2 using the Whole Atmosphere Community Climate Model configuration, known as CESM2(WACCM6), show evidence of dynamical coupling from the high latitudes of the winter middle atmosphere to the tropics and the middle and high latitudes of the summer hemisphere.</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/PedatellaThreeWACCM-realizations.png?itok=PR9HJLx8" width="926" height="780" alt="Differences in the monthly mean temperature from the long-term average over three WACCM realizations" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>Differences in the monthly mean temperature from the long-term average over three WACCM realizations. The months are sorted by the perturbation temperature in the high latitude winter stratosphere, specifically the region poleward of 60° and between 10 and 1 hPa (warmer than average in the left column; cooler in the middle column). The right column gives the differences of the two panels to the left. The top row is for NH winter in January and the bottom row is for SH winter in September. The contour interval is 2 K; the zero contour is not shown; and contours for 1 K and -1 K are shown as dashed lines. The numbers in parentheses show the number of months contributing to the average.</p> </figcaption> </figure> <p>Analysis of monthly and daily output covering 195 simulation years indicates that the response in the summer middle and high latitudes has a weak overall magnitude of a few Kelvin or less in temperature but has a repeatable pattern whose structure and phase agree with observational studies. Lag correlation indicates that perturbations in wave activity in the winter stratosphere, as quantified by EP flux divergence, are accompanied by perturbations in the transformed Eulerian mean meridional wind extending into the summer hemisphere. There is not an appreciable correlation with momentum forcing in the summer hemisphere by either resolved waves or parameterized gravity waves. The rapid circulation response and the lack of a wave response in the summer hemisphere suggest that the interhemispheric coupling that is simulated in WACCM6 in both the stratosphere and mesosphere owes its existence to a circulation that develops to restore balance to the zonally averaged state of the atmosphere. This is an alternative explanation for the coupling from the winter stratosphere to the summer mesosphere; previous studies have assumed a necessary role for wave activity in the summer hemisphere.</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-c205e3ea9bdf162a053f4a4174525bbcd04e38e90d66260db3356a324519977d"> <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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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="2020-01-07T12:00:00Z" class="datetime">Tue, 01/07/2020 - 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/16" hreflang="en">Nick Pedatella</a>, <a href="/taxonomy/term/7" hreflang="en">Earth&#039;s upper atmosphere</a>, <a href="/taxonomy/term/13" hreflang="en">modeling</a>, <a href="/taxonomy/term/17" hreflang="en">WACCM</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Thu, 18 Nov 2021 19:30:34 +0000 kolinski 85 at https://www2.hao.ucar.edu Upper atmosphere radiance data assimilation: A feasibility study for GOLD far ultraviolet observations https://www2.hao.ucar.edu/news/publication-highlight/upper-atmosphere-radiance-data-assimilation-feasibility-study-gold-far <span class="field field--name-title field--type-string field--label-hidden">Upper atmosphere radiance data assimilation: A feasibility study for GOLD far ultraviolet observations</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 - 12:25</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/7">Earth's upper atmosphere</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: Journal of Geophysical Research Space Physics; First HAO Author&#039;s Name: Stanley C. Solomon</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>Availability of far ultraviolet observations of Earth’s dayglow by the NASA Global-scale Observations of the Limb and Disk (GOLD) mission presents an unparalleled opportunity for upper atmosphere radiance data assimilation.</p> <p>Assimilation of the observed dayglow emissions can be formulated in a similar fashion to lower atmosphere radiance data assimilation approaches using the sensitivity of the Lyman-Birge-Hopfield (LBH) band emission to thermospheric temperature. To demonstrate such an approach, this paper presents a proof-of-concept implementation of an ensemble filter measurement update step using ensemble simulation of the thermosphere and LBH emission by the NOAA's Whole Atmosphere Model (WAM) and NCAR’s Global Airglow model.</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/SolomonAccuracyTemperatureEstimates.png?itok=8NT2tdwY" width="926" height="290" alt="Accuracy of temperature estimates in the measurement update step for four different assimilated observations" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>Accuracy of temperature estimates in the measurement update step for four different assimilated observations.</p> </figcaption> </figure> <p>Testing the approach with observing system simulation experiments has yielded the following findings: (1) Assimilation of GOLD LBH disk emission data can reduce the error in model temperature specification from forecast to analysis by 97% under geomagnetically quiet conditions and 87% under disturbed conditions, (2) The reduction in model uncertainty from forecast to analysis as a result of GOLD assimilation is ~20% in the lower thermosphere and ~25% in the upper thermosphere, and (3) Ingestion of three prominent LBH features, in comparison to the entire LBH spectrum, into the WAM leads to more accurate assimilation analyses. With the help of a radiance data assimilation approach, the utility of GOLD observations can be extended to reveal global, time-dependent, altitude-resolved thermospheric structure, offering the key to addressing a number of outstanding questions such as those relating to the properties of travelling atmospheric disturbances.</p> <p>Link to paper: <a href="https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019JA026910">Upper atmosphere radiance data assimilation: A feasibility study for GOLD far ultraviolet observations</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-41755103f8bf2ad8384e1403693690ff428da2f0d7880e0c5d4707bacc309c52"> <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> </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="2020-01-07T12:00:00Z" class="datetime">Tue, 01/07/2020 - 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/29" hreflang="en">Stan Solomon</a>, <a href="/taxonomy/term/7" hreflang="en">Earth&#039;s upper atmosphere</a>, <a href="/taxonomy/term/37" hreflang="en">GOLD</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Thu, 18 Nov 2021 19:25:07 +0000 kolinski 84 at https://www2.hao.ucar.edu On the importance of interactive ozone chemistry in Earth-System models for studying MLT tidal changes during sudden stratospheric warmings https://www2.hao.ucar.edu/news/publication-highlight/importance-interactive-ozone-chemistry-earth-system-models-studying-mlt <span class="field field--name-title field--type-string field--label-hidden">On the importance of interactive ozone chemistry in Earth-System models for studying MLT tidal changes during sudden stratospheric warmings</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 - 12:17</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/7">Earth's upper atmosphere</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: Journal of Geophysical Research–Space Physics; First HAO Author&#039;s Name: Tarique Siddiqui</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 use the CESM2-WACCM, to study the importance of ozone in the vertical coupling between lower and upper atmosphere during SSWs. During SSWs, the build-up of stratospheric ozone concentrations at tropical latitudes and its increased asymmetrical distribution carries the potential to affect the generation of migrating and non-migrating semidiurnal solar tides.</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/Siddiqui-SW2_amplitudeNeutralTemperature.png?itok=XAsRdAed" width="926" height="540" alt="SW2 amplitude in neutral temperature" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>SW2 amplitude in neutral temperature at 110 km for (a) SD-WACCM, and © SC-WACCM. The corresponding SW2 phases are presented in (b) and (d). The difference and percentage difference of SW2 amplitudes between the two simulations are presented in (e) and (f), respectively. The dashed black line in (e) and (f) mark the region in which the SW2 tidal amplitudes from SD-WACCM exceed 10 K. Below this value, the difference and percentage difference values are shaded in white in (e) and (f), respectively.</p> </figcaption> </figure> <p>Much of the upper atmospheric variability associated with SSWs is known to be driven by large changes in the vertically propagating semidiurnal migrating (SW2) and non-migrating (SW1 and SW3) solar tides. In this study, we investigate the effect of stratospheric ozone variability during SSWs on these solar tides. For this purpose, a case study of the 2009 SSW event is carried out using WACCM with two distinct simulation setups. In the first setup, the ozone concentrations are interactively calculated in the model and resemble the ozone observations during the 2009 SSW event while in the second setup, the ozone concentrations are specified using zonal mean values. We constrain both of the simulations to the MERRA-2 renanalysis so that the background atmosphere through which the solar tides propagate are almost identical in each case. Following the onset of the SSW, we find that in the vicinity of the peak enhancements of SW1, SW2 and SW3 in the MLT, the amplitudes of these semidiurnal solar tides to be approximately about 15-50% larger for the simulation with interactive ozone as compared to the one with prescribed ozone, indicating that the stratospheric ozone variability plays an important role in driving semidiurnal solar tidal changes during SSWs.</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-c6a6a254d0230df56fcb88a0365417d2bdeaf41a44b7dc8c8ccd74cae5d075c4"> <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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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="2020-02-05T12:00:00Z" class="datetime">Wed, 02/05/2020 - 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/8" hreflang="en">Astrid Maute</a>, <a href="/taxonomy/term/16" hreflang="en">Nick Pedatella</a>, <a href="/taxonomy/term/7" hreflang="en">Earth&#039;s upper atmosphere</a>, <a href="/taxonomy/term/13" hreflang="en">modeling</a>, <a href="/taxonomy/term/17" hreflang="en">WACCM</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Thu, 18 Nov 2021 19:17:42 +0000 kolinski 82 at https://www2.hao.ucar.edu