GOLD 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/37">GOLD</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-c3cf32c8d2028966a9936f98847e48504b2ca9fff6dbe286ca1cf4bb23a8fc8e"> <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/37">GOLD</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-38b9611e7665e06fad8c48884d9967d7f80bfbcf53ef49203a661c1545ba8fc9"> <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 src="/sites/default/files/styles/large/public/2022-10/Qian%2CLiying_Lat-longDistr.NmF2simula.png?itok=HZnaJDN2" width="480" height="250" alt="Latitude-longitude distribution and NmF2 simulation" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 18, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/investigation-post-sunset-extra-electron-density-peak-poleward"><span class="field field--name-title field--type-string field--label-hidden">Investigation of the Post-Sunset Extra Electron Density Peak Poleward of the Equatorial Ionization Anomaly Southern Crest</span> </a> </h3> </div> </div> </div> <div class="row row-cols-1 row-cols-sm-2 row-cols-md-3 g-2 g-md-4 row-3"> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/lagrangian-study-tidal-advection-mesospheric-water-vapor" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Pedatella_DW1advectedH2O.png?itok=QXmqdjt2" width="479" height="480" alt="DW1 advected H2O volume mixing ratio" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 19, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/lagrangian-study-tidal-advection-mesospheric-water-vapor"><span class="field field--name-title field--type-string field--label-hidden">A Lagrangian Study of Tidal Advection of Mesospheric Water Vapor</span> </a> </h3> </div> </div> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/coronal-cavities-comp-observations" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Gibson_CavityWidths-SDO.AIA__0.png?itok=gN76eNR5" width="455" height="480" alt="Cavity widths observed by SDO/AIA" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 27, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/coronal-cavities-comp-observations"><span class="field field--name-title field--type-string field--label-hidden">Coronal Cavities in CoMP Observations</span> </a> </h3> </div> </div> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/inter-hemispheric-asymmetries-high-latitude-electrodynamic-forcing-and" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Zhu_Temporal%20variations%20of%20the%20ion%20convection%20boundary.png?itok=xU0LXQHY" width="480" height="255" alt="Temporal variations of the ion convection boundary" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 14, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/inter-hemispheric-asymmetries-high-latitude-electrodynamic-forcing-and"><span class="field field--name-title field--type-string field--label-hidden">Inter-Hemispheric Asymmetries in the High-Latitude Electrodynamic Forcing and the Thermosphere During the October 8-9, 2012 Geomagnetic Storm: An Integrated Data-Model Investigation</span> </a> </h3> </div> </div> </div> <div class="row row-cols-1 row-cols-sm-2 row-cols-md-3 g-2 g-md-4 row-4"> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/seasonal-variations-small-scale-waves-observed-icon-mighti" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Maute_perturbationAmplitudes.jpg?itok=BRSLJoPb" width="480" height="326" alt="Seasonal variations of monthly-zonal-mean small-scale perturbation amplitudes" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 18, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/seasonal-variations-small-scale-waves-observed-icon-mighti"><span class="field field--name-title field--type-string field--label-hidden">Seasonal Variations of Small-Scale Waves observed by ICON-MIGHTI</span> </a> </h3> </div> </div> </div> </div> </div> </div> </div> </div> <div class="block block-layout-builder block-field-blocknodearticlefield-story-date"> <div class="field field--name-field-story-date field--type-datetime field--label-above"> <div class="field__label">Date</div> <div class="field__item"><time datetime="2022-06-17T12:00:00Z" class="datetime">Fri, 06/17/2022 - 12:00</time> </div> </div> </div> </main> <aside class="layout__region layout__region--sidebar resources-wrapper d-print-none"> <div class="block block-layout-builder block-field-blocknodearticlefield-article-tags"> <div class="resources-wrapper d-print-none"> <div class="resources related mb-4"> <h2 class="p-2 px-md-3">Tags</h2> <div class="p-2 px-md-3 py-md-3"> <a href="/taxonomy/term/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 NASA Features Research by HAO Scientist Xuguang Cai https://www2.hao.ucar.edu/news/news-article/nasa-features-research-hao-scientist-xuguang-cai <span class="field field--name-title field--type-string field--label-hidden">NASA Features Research by HAO Scientist Xuguang Cai</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 - 13:58</span> <div class="layout__region--twocol d-grid d-print-flex with-sidebar"> <div class="layout__region layout__region--main-top breadcrumb-wrapper mt-2"> <div class="block block-system block-system-breadcrumb-block"> <nav class="mb-2 d-print-none" role="navigation" aria-labelledby="system-breadcrumb"> <h2 id="system-breadcrumb" class="visually-hidden">Breadcrumb</h2> <ol class="breadcrumb"> <li class="breadcrumb-item"> <a href="/">Home</a> </li> <li class="breadcrumb-item"> <a href="/taxonomy/term/37">GOLD</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>Since 2017, HAO has provided scientific support and analysis for NASA's Global-scale Observations of the Limb and Disk (GOLD).&nbsp;This mission includes a ultraviolet imaging spectrograph that flies on a commercial communications satellite in geostationary orbit taking images of the Earth's thermosphere and ionosphere. NASA's recent featured article discusses the "unexpected behavior" captured by GOLD images. The article quotes Dr.Xuguang Cai, a researcher at HAO: "Since GOLD is on a geostationary satellite, we can capture 2D time evolution of these dynamics." Recently, several of Dr. Cai's research papers have been reported by NASA.gov, and are cited on these pages:</p> <ul> <li> <p><a href="https://www.nasa.gov/feature/goddard/2021/gold-s-bird-s-eye-reveals-dynamics-in-earth-s-interface-to-space">GOLD’s Bird’s-Eye Reveals Dynamics in Earth’s Interface to Space</a></p> </li> <li> <p><a href="https://blogs.nasa.gov/sunspot/2021/08/30/golds-top-down-view-of-our-atmosphere/">GOLD’s Top-Down View of Our Atmosphere</a></p> </li> </ul> </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-df41c7e00a26486f01a5dd9a3da0e06946d02ba7a60a84eda8bbbc3294b0cb62"> <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 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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 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<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 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src="/sites/default/files/styles/large/public/2022-10/Zhu_Temporal%20variations%20of%20the%20ion%20convection%20boundary.png?itok=xU0LXQHY" width="480" height="255" alt="Temporal variations of the ion convection boundary" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 14, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/inter-hemispheric-asymmetries-high-latitude-electrodynamic-forcing-and"><span class="field field--name-title field--type-string field--label-hidden">Inter-Hemispheric Asymmetries in the High-Latitude Electrodynamic Forcing and the Thermosphere During the October 8-9, 2012 Geomagnetic Storm: An Integrated Data-Model Investigation</span> </a> </h3> </div> </div> </div> <div class="row row-cols-1 row-cols-sm-2 row-cols-md-3 g-2 g-md-4 row-4"> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/publication-highlight/seasonal-variations-small-scale-waves-observed-icon-mighti" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-10/Maute_perturbationAmplitudes.jpg?itok=BRSLJoPb" width="480" height="326" alt="Seasonal variations of monthly-zonal-mean small-scale perturbation amplitudes" loading="lazy" typeof="foaf:Image" class="image-style-large img-fluid" /> </a> </div> </figure> <div class="pb-1 text-gray-dark text-uppercase date--sm">Oct 18, 2022</div> <h3 class="card-title"> <a href="/news/publication-highlight/seasonal-variations-small-scale-waves-observed-icon-mighti"><span class="field field--name-title field--type-string field--label-hidden">Seasonal Variations of Small-Scale Waves observed by ICON-MIGHTI</span> </a> </h3> </div> </div> </div> </div> </div> </div> </div> </div> <div class="block block-layout-builder block-field-blocknodearticlefield-story-date"> <div class="field field--name-field-story-date field--type-datetime field--label-above"> <div class="field__label">Date</div> <div class="field__item"><time datetime="2021-09-07T12:00:00Z" class="datetime">Tue, 09/07/2021 - 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/31" hreflang="en">Alan Burns</a>, <a href="/taxonomy/term/32" hreflang="en">Jing Liu</a>, <a href="/taxonomy/term/27" hreflang="en">Liying Qian</a>, <a href="/taxonomy/term/29" hreflang="en">Stan Solomon</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/37" hreflang="en">GOLD</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Thu, 18 Nov 2021 20:58:13 +0000 kolinski 87 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/37">GOLD</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-47a8fd9f8fa8bd8f0621a188807096774b710666fd32c3f9240edb0ec11511a0"> <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 Thermospheric composition O/N2 response to an altered meridional mean circulation during Sudden Stratospheric Warmings observed by GOLD https://www2.hao.ucar.edu/news/publication-highlight/thermospheric-composition-on2-response-altered-meridional-mean <span class="field field--name-title field--type-string field--label-hidden">Thermospheric composition O/N2 response to an altered meridional mean circulation during Sudden Stratospheric Warmings observed by GOLD</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 - 11:50</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/37">GOLD</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: Geophysical Research Letters; 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>GOLD measurements provide the first observational proof of model predictions that the break up of the stratospheric polar vortex changes the composition of the thermosphere.</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/Pedatella_Gold.png?itok=_nOU9jcp" width="926" height="400" alt="GOLD plots" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>(a) GOLD O/N2 ratios for 15 December 2018 (day 349, geomagnetic quiet, SZA&lt; 80, 113W to 19E), averaged over all 30 minute cadence images taken during daytime. (b) Time series of O/N2 daytime means averaged over all observed longitudes as a function of geographic latitude (color contours), along with 10 hPa mean zonal winds in the stratosphere at 60N from MERRA-2 (black line). A SSW occurred around day 370 with onset on day 355. The lower panel shows the 3-hourly Kp index (black) and the F10.7 cm radio flux. © Same as (b) but with mean, annual and semi-annual components removed, using all available Level 2 data (6 Oct 2018 – 13 Aug 2019). Plotted as percent deviation.</p> </figcaption> </figure> <p>The important O/N2 ratio is depleted by ~10% through a rather complex chain of processes that connect global-scale waves from the lower atmosphere, wave dissipation, mean meridional circulation, turbulent eddy transport, and molecular diffusion to produce a global O/N2 reduction in the thermosphere. The observed composition changes will likely impact Earth’s ionospheric plasma environment and imply a substantial impact of the lower and middle atmosphere on space weather.</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-bd5d488ae0d82ef37338f1de17d5cf294a51a0c905e71edd01473e82260dd343"> <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="2020-02-12T12:00:00Z" class="datetime">Wed, 02/12/2020 - 12:00</time> </div> </div> </div> </main> <aside class="layout__region layout__region--sidebar resources-wrapper d-print-none"> <div class="block block-layout-builder block-field-blocknodearticlefield-article-tags"> <div class="resources-wrapper d-print-none"> <div class="resources related mb-4"> <h2 class="p-2 px-md-3">Tags</h2> <div class="p-2 px-md-3 py-md-3"> <a href="/taxonomy/term/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> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Thu, 18 Nov 2021 18:50:45 +0000 kolinski 78 at https://www2.hao.ucar.edu Global-scale Measurements of the Limb and Disk (GOLD) Mission Implementation: Instrument Design and Early Flight Performance https://www2.hao.ucar.edu/news/publication-highlight/global-scale-measurements-limb-and-disk-gold-mission-implementation <span class="field field--name-title field--type-string field--label-hidden">Global-scale Measurements of the Limb and Disk (GOLD) Mission Implementation: Instrument Design and Early Flight Performance</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/3" typeof="schema:Person" property="schema:name" datatype="">kolinski</span></span> <span class="field field--name-created field--type-created field--label-hidden">Wed, 11/17/2021 - 13:03</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/37">GOLD</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">ublication Name: Journal of Geophysical Research Space Physics; First HAO Author&#039;s Name: Stan Solomon; Authors: McClintock, W. E., Richard Eastes, Alan Hoskins, Oswald Siegmund, Jason McPhate, Andrey Krywonos, Stanley Solomon, and Alan Burns </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 17, 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>The Global-scale Observations of the Limb and Disk (GOLD) is a NASA mission of opportunity designed to study how the Earth’s ionosphere-thermosphere system responds to geomagnetic storms, solar radiation and upward propagating tides on time scales as short as 30 minutes.</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/GoldOpticsSchematic.jpg?itok=3S6R9OtR" width="926" height="1004" alt="Sectional view of a GOLD spectroscopic imaging channel" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>Sectional view of a GOLD spectroscopic imaging channel.</p> </figcaption> </figure> <p>GOLD employs two identical ultraviolet spectrographs that make observations of the Earth’s thermosphere and ionosphere from a commercial communications satellite owned and operated by SES and located in geostationary orbit at 47.5° west longitude (near the mouth of the Amazon River). They make images of atomic oxygen 135.6 nm and N2 LBH radiances of the entire disk that is observable from geostationary orbit and on the near-equatorial limb. They also observe occultations of stars to measure molecular oxygen column densities on the limb. Here we describe the GOLD instrument including its optical system and detector. Its performance was characterized in the lab before launch. We compare measurements of laboratory sources made then to observations of the thermosphere after launch and find good agreement.</p> <p>Link to paper: <a href="https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020JA027797">Global-scale Measurements of the Limb and Disk (GOLD) Mission Implementation: 1. 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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="2020-05-12T12:00:00Z" class="datetime">Tue, 05/12/2020 - 12:00</time> </div> </div> </div> </main> <aside class="layout__region layout__region--sidebar resources-wrapper d-print-none"> <div class="block block-layout-builder block-field-blocknodearticlefield-article-tags"> <div class="resources-wrapper d-print-none"> <div class="resources related mb-4"> <h2 class="p-2 px-md-3">Tags</h2> <div class="p-2 px-md-3 py-md-3"> <a href="/taxonomy/term/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> Wed, 17 Nov 2021 20:03:40 +0000 kolinski 66 at https://www2.hao.ucar.edu Comparison of GOLD nighttime measurements with total electron content: preliminary results https://www2.hao.ucar.edu/news/publication-highlight/comparison-gold-nighttime-measurements-total-electron-content <span class="field field--name-title field--type-string field--label-hidden">Comparison of GOLD nighttime measurements with total electron content: preliminary results</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/3" typeof="schema:Person" property="schema:name" datatype="">kolinski</span></span> <span class="field field--name-created field--type-created field--label-hidden">Tue, 11/16/2021 - 15:37</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/37">GOLD</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">ublication: Journal of Geophysical Research, Space Physics; Authors: Xuguang Cai, Alan G. Burns, Wenbin Wang, Anthea Coster, Liying Qian, Jing Liu, Stanley C. Solomon, Richard W. Eastes, Robert E. Daniell, William E. McClintock</p> </div> <div class="block block-layout-builder block-extra-field-blocknodearticleauthor-and-created"> <div class="author_created row gx-0"> <div class="col"> <div class="fw-bold fs-6">Author:</div> <div class="author_created__name fs-6">kolinski</div> <div class="author_created__date text-gray-dark fs-6">Nov 16, 2021</div> </div> </div> </div> <div class="mt-3 mt-md-4 block block-layout-builder block-field-blocknodearticlefield-main-content"> <div class="field field--name-field-main-content field--type-entity-reference-revisions field--label-hidden field__items"> <div class="field__item"> <div class="paragraph paragraph--type--rich-text paragraph--view-mode--default"> <div class="clearfix text-formatted field field--name-field-body field--type-text-long field--label-hidden field__item"><p>The National Aeronautics and Space Administration (NASA) Global‐scale Observations of the Limb and Disk (GOLD) has been imaging the thermosphere and ionosphere since October 2018. It provides continuous measurements over a large area from its geostationary orbit. The unambiguous 2-dimensional (2D) maps of OI 135.6 nm radiance retrieved from GOLD after sunset are compared with the total electron content (TEC) maps measured by GPS receivers in the American sector. The OI 135.6 nm radiance observed by GOLD is an indicator of the peak electron density of the ionosphere F2 region, while the TEC is the total electron density in the column.</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/XuguangCai_Figure.png?itok=dXWkCOQj" width="926" height="914" alt="The comparison between the GOLD map and TEC2 map on DOY 72 in 2019 23:10-23:40 (top) and 23:55-24:25 (bottom)" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>The comparison between the GOLD map and TEC2 map on DOY 72 in 2019 23:10-23:40 (top) and 23:55-24:25 (bottom). The white part stands for the data unavailability and the pink line is the geomagnetic equator. The black points stand for the location of the peaks of the EIA.</p> </figcaption> </figure> <p>Our comparisons show that the two datasets match each other very well in the equatorial ionization anomaly (EIA) morphology and its seasonal variability. Equatorial plasma bubbles (EPBs) are evident in GOLD nighttime OI 135.6 radiance. Corresponding depletions are shown in TEC maps, but without GOLD data as a reference, it is difficult to discern that the depletions are EPBs. In addition, both GOLD 135.6 radiance and TEC maps observed third peaks of electron density poleward of the southern EIA crests. Furthermore, both show that the ionosphere after sunset is quite dynamic and has strong day-to-day variability. In all, the GOLD and TEC have valuable synergy to allow us to gain a better understanding of the equatorial ionosphere.</p> <p>Link to paper: <a href="https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019JA027767">Comparison of GOLD Nighttime Measurements With Total Electron Content: Preliminary Results</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-a94fabb797609c35a69a0b5aba87f8d9b07308bf9750ac51b24872dd2c7f6693"> <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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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 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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 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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="2020-08-28T12:00:00Z" class="datetime">Fri, 08/28/2020 - 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/31" hreflang="en">Alan Burns</a>, <a href="/taxonomy/term/27" hreflang="en">Liying Qian</a>, <a href="/taxonomy/term/29" hreflang="en">Stan Solomon</a>, <a href="/taxonomy/term/9" hreflang="en">Wenbin Wang</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> Tue, 16 Nov 2021 22:37:36 +0000 kolinski 50 at https://www2.hao.ucar.edu The 2‐D Evolution of Thermospheric ∑O/N2 Response to Weak Geomagnetic Activity During Solar‐Minimum Observed by GOLD https://www2.hao.ucar.edu/news/publication-highlight/2-d-evolution-thermospheric-on2-response-weak-geomagnetic-activity <span class="field field--name-title field--type-string field--label-hidden">The 2‐D Evolution of Thermospheric ∑O/N2 Response to Weak Geomagnetic Activity During Solar‐Minimum Observed by GOLD</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/3" typeof="schema:Person" property="schema:name" datatype="">kolinski</span></span> <span class="field field--name-created field--type-created field--label-hidden">Tue, 11/16/2021 - 15:34</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/37">GOLD</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: Geophysical Research Letters; First HAO Author&#039;s Name: Xuguang Cai; Other Authors: Alan G. Burns, Wenbin Wang, Liying Qian, Stanley C. Solomon Richard W. Eastes, Nicolas Pedatella, Robert E. Daniell, Will</p> </div> <div class="block block-layout-builder block-extra-field-blocknodearticleauthor-and-created"> <div class="author_created row gx-0"> <div class="col"> <div class="fw-bold fs-6">Author:</div> <div class="author_created__name fs-6">kolinski</div> <div class="author_created__date text-gray-dark fs-6">Nov 16, 2021</div> </div> </div> </div> <div class="mt-3 mt-md-4 block block-layout-builder block-field-blocknodearticlefield-main-content"> <div class="field field--name-field-main-content field--type-entity-reference-revisions field--label-hidden field__items"> <div class="field__item"> <div class="paragraph paragraph--type--rich-text paragraph--view-mode--default"> <div class="clearfix text-formatted field field--name-field-body field--type-text-long field--label-hidden field__item"><p>We conduct observational and modeling studies of thermospheric composition responses to weak geomagnetic activity (non-geomagnetic storms). We found that the thermospheric O and N 2 column density ratio (∑O/N 2 ) in part of the Northern Hemisphere measured by Global-scale Observations of the Limb and Disk (GOLD) exhibited large and long-lived depletions during weak geomagnetic activity in May and June 2019.</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/Cai%2CX_2D-EvolutionOfThermospheric-%E2%88%91O_N2-response_0.jpg?itok=IqLQqRiw" width="926" height="425" alt="(top) The Kp and Dst index of three cases (DOY 145 to 148; DOY 153 to 156; DOY 162 to 165); (middle) latitude-longitude distribution of ∑O/N2 percentage difference between two quiet days in three cases; (bottom) percentage difference of ∑O/N2 between disturbed and quiet days in three cases. Corresponding local time is marked on longitude interval" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>(top) The Kp and Dst index of three cases (DOY 145 to 148; DOY 153 to 156; DOY 162 to 165); (middle) latitude-longitude distribution of ∑O/N2 percentage difference between two quiet days in three cases; (bottom) percentage difference of ∑O/N2 between disturbed and quiet days in three cases. Corresponding local time is marked on longitude interval.</p> </figcaption> </figure> <p>The depletions reached 30% of quiet time values, extended equatorward to 10°N, and lasted more than 10 hours. Furthermore, numerical simulation results are similar to these observations and indicate that the ∑O/N 2 depletions were pushed westward by zonal winds. The ∑O/N 2 evolution during weak geomagnetic activity suggests that the formation mechanism of the ∑O/N 2 depletions is similar to that during a geomagnetic storm. The effects of weak geomagnetic activity are often ignored, but, in fact, are important for understanding thermosphere neutral composition variability and hence the state of the thermosphere-ionosphere system.</p> <div class="resources-main border-0"> <a href="/sites/default/files/2021-11/2020%20Cai%20The%20two%20dimensional%20Evolution.pdf" class="i-file-pdf--before" target="_blank">2020 Cai The two dimensional Evolution</a> </div> </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-11e1b802a4a74174de8fcba6bd4fe4ba74ffb23286027819f3e34ae823325bda"> <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 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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="2020-09-16T12:00:00Z" class="datetime">Wed, 09/16/2020 - 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/31" hreflang="en">Alan Burns</a>, <a href="/taxonomy/term/27" hreflang="en">Liying Qian</a>, <a href="/taxonomy/term/16" hreflang="en">Nick Pedatella</a>, <a href="/taxonomy/term/29" hreflang="en">Stan Solomon</a>, <a href="/taxonomy/term/9" hreflang="en">Wenbin Wang</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> Tue, 16 Nov 2021 22:34:30 +0000 kolinski 49 at https://www2.hao.ucar.edu Impact of GOLD Retrieved Thermospheric Temperatures on a Whole Atmosphere Data Assimilation Model https://www2.hao.ucar.edu/news/publication-highlight/impact-gold-retrieved-thermospheric-temperatures-whole-atmosphere-data <span class="field field--name-title field--type-string field--label-hidden">Impact of GOLD Retrieved Thermospheric Temperatures on a Whole Atmosphere Data Assimilation Model</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/3" typeof="schema:Person" property="schema:name" datatype="">kolinski</span></span> <span class="field field--name-created field--type-created field--label-hidden">Tue, 11/16/2021 - 15:02</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/37">GOLD</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: F. I. Laskar, N. M. Pedatella, M. V. Codrescu, R. W. Eastes, J. S. Evans, A. G. Burns, and W. McClintock</p> </div> <div class="block block-layout-builder block-extra-field-blocknodearticleauthor-and-created"> <div class="author_created row gx-0"> <div class="col"> <div class="fw-bold fs-6">Author:</div> <div class="author_created__name fs-6">kolinski</div> <div class="author_created__date text-gray-dark fs-6">Nov 16, 2021</div> </div> </div> </div> <div class="mt-3 mt-md-4 block block-layout-builder block-field-blocknodearticlefield-main-content"> <div class="field field--name-field-main-content field--type-entity-reference-revisions field--label-hidden field__items"> <div class="field__item"> <div class="paragraph paragraph--type--rich-text paragraph--view-mode--default"> <div class="clearfix text-formatted field field--name-field-body field--type-text-long field--label-hidden field__item"><p>The present investigation evaluates the assimilation of synthetic data which has properties similar to actual Global-scale Observations of the Limb and Disk (GOLD) level-2 (L2) and other conventional lower atmospheric observations. The lower atmospheric and GOLD L2 temperature (Tdisk) are assimilated in the Whole Atmosphere Community Climate Model with thermosphere-ionosphere eXtension (WACCMX) using Data Assimilation Research Testbed (DART).</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/Pedatella_whole%20atmosphere%20temperature%20profiles.jpg?itok=7vSiM40f" width="926" height="698" alt="Comparison of the whole atmosphere temperature profiles from the true state, lower atmosphere only assimilation (LA), and lower-atmosphere plus GOLD assimilation (LA+GOLD) for 14 UT (left column) and 18 UT (right column) at different locations inside the GOLD field of view (top) and for the zonal mean (bottom)" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>Comparison of the whole atmosphere temperature profiles from the true state, lower atmosphere only assimilation (LA), and lower-atmosphere plus GOLD assimilation (LA+GOLD) for 14 UT (left column) and 18 UT (right column) at different locations inside the GOLD field of view (top) and for the zonal mean (bottom). The results show that there is significant improvement in the thermosphere temperatures in the LA+GOLD assimilation case compared to the LA only assimilation case.</p> </figcaption> </figure> <p>It is found that inclusion of the GOLD Tdisk improves the forecast root mean square error (RMSE) and bias by 5% and 71%. When compared to lower atmosphere only assimilation the improvements in RMSE and bias are 20% and 94%. An investigation of the global DW1 and local diurnal tidal characteristics shows that inclusion of the GOLD temperatures improves the DW1 by about 8% and diurnal tide by more than 17%. The percentage improvement in tides is higher at lower thermospheric altitudes. Considerable improvements in the model state are also seen at times and locations where there are no GOLD observations available. These results and the background data assimilation procedure are presented here, which demonstrates that GOLD thermospheric temperature is an excellent dataset which can be used for thermospheric assimilation studies and operational purposes.</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-1a894e5216aee3ebdad9f169b03513eab8cb0907062ce7d888f538ab7f71a923"> <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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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="2020-11-10T12:00:00Z" class="datetime">Tue, 11/10/2020 - 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/37" hreflang="en">GOLD</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> Tue, 16 Nov 2021 22:02:12 +0000 kolinski 42 at https://www2.hao.ucar.edu Observation of Postsunset OI 135.6 nm radiance Enhancement in South America by the Global-scale Observation of Limb and Disk (GOLD) Mission https://www2.hao.ucar.edu/news/publication-highlight/observation-postsunset-oi-1356-nm-radiance-enhancement-south-america <span class="field field--name-title field--type-string field--label-hidden">Observation of Postsunset OI 135.6 nm radiance Enhancement in South America by the Global-scale Observation of Limb and Disk (GOLD) Mission</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/3" typeof="schema:Person" property="schema:name" datatype="">kolinski</span></span> <span class="field field--name-created field--type-created field--label-hidden">Tue, 11/16/2021 - 14:43</span> <div class="layout__region--twocol d-grid d-print-flex with-sidebar"> <div class="layout__region layout__region--main-top breadcrumb-wrapper mt-2"> <div class="block block-system block-system-breadcrumb-block"> <nav class="mb-2 d-print-none" role="navigation" aria-labelledby="system-breadcrumb"> <h2 id="system-breadcrumb" class="visually-hidden">Breadcrumb</h2> <ol class="breadcrumb"> <li class="breadcrumb-item"> <a href="/">Home</a> </li> <li class="breadcrumb-item"> <a href="/taxonomy/term/37">GOLD</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: Xuguang Cai, Alan G. Burns, Wenbin Wang, Liying Qian, Jing Liu, Stanley C. Solomon, Richard W. Eastes, Robert E. Daniell</p> </div> <div class="block block-layout-builder block-extra-field-blocknodearticleauthor-and-created"> <div class="author_created row gx-0"> <div class="col"> <div class="fw-bold fs-6">Author:</div> <div class="author_created__name fs-6">kolinski</div> <div class="author_created__date text-gray-dark fs-6">Nov 16, 2021</div> </div> </div> </div> <div class="mt-3 mt-md-4 block block-layout-builder block-field-blocknodearticlefield-main-content"> <div class="field field--name-field-main-content field--type-entity-reference-revisions field--label-hidden field__items"> <div class="field__item"> <div class="paragraph paragraph--type--rich-text paragraph--view-mode--default"> <div class="clearfix text-formatted field field--name-field-body field--type-text-long field--label-hidden field__item"><p>The Global-scale Observation of Limb and Disk (GOLD) mission, for the first time, provides synoptic two-dimensional (2D) maps of OI 135.6 nm observations. These maps describe the unambiguous and dynamic evolution of nighttime ionospheric F2-peak electron densities (NmF2) as the 135.6 nm airglow emission radiance correlates well with NmF2 at night. On November 19, 2018, the 135.6 nm radiance measured by GOLD, NmF2 measured by a digisonde, and GPS total electron content (TEC) measurements at Cachoeira Paulista (CP) all showed a postsunset enhancement, with an increase near 22:30 universal time.</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/Cai_GOLD-Channel-B.jpg?itok=zPGnUD5J" width="926" height="425" alt="The latitude-longitude distribution of the OI 135.6 nm radiance measured by GOLD Channel B from 22:25 to 23:55 UT (22:25, 22:55, 23:10, 23:25, 23:40 and 23:55) on Nov 19, 2018" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>The latitude-longitude distribution of the OI 135.6 nm radiance measured by GOLD Channel B from 22:25 to 23:55 UT (22:25, 22:55, 23:10, 23:25, 23:40 and 23:55) on Nov 19, 2018. The white cross in each subplot marked the location of CP (22.7°S, 45°W), and the black point is the location of EIA southern crest peak at 45°W. The red line marked the coast line of South America continent. The white area on each subplot stand for the area that is not scanned by GOLD.</p> </figcaption> </figure> <p>The 135.6 nm radiance map showed that this enhancement was due to the southward movement of the southern equatorial ionization anomaly (EIA) crest. Therefore, the GOLD observation showed the linkage between postsunset enhancement of NmF2 and EIA movement. Furthermore, unlike the southward movement of the southern crest, the corresponding EIA northern crest, however, did not show northward motion. This is the first time that the EIA hemispheric asymmetry, which included both different densities and movement of two crests in a short time period (less than 2-hours), was captured. The cause of this asymmetric movement of the two crests is not clear and requires further investigation.</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-f78ea107e024a909f1f0b93c0a712c6ce4c5d9bb84514cfbc65d27a44aea131c"> <div class="view-content"> <div class="views-view-grid horizontal cols-3 col-12 mb-2 mb-md-4"> <div class="row row-cols-1 row-cols-sm-2 row-cols-md-3 g-2 g-md-4 row-1"> <div class="col"><div class="pb-3 pb-md-0"> <figure> <div class="field field--name-field-primary-image field--type-entity-reference field--label-hidden field__item"> <a href="/news/news-article/hawaiis-mauna-loa-erupts-after-38-years-mauna-loa-solar-observatory-temporarily" hreflang="en"><img src="/sites/default/files/styles/large/public/2022-11/MLeruptionLava.png?itok=NHfdX7TB" width="480" 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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="2020-12-08T12:00:00Z" class="datetime">Tue, 12/08/2020 - 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/31" hreflang="en">Alan Burns</a>, <a href="/taxonomy/term/32" hreflang="en">Jing Liu</a>, <a href="/taxonomy/term/27" hreflang="en">Liying Qian</a>, <a href="/taxonomy/term/29" hreflang="en">Stan Solomon</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/37" hreflang="en">GOLD</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Tue, 16 Nov 2021 21:43:25 +0000 kolinski 39 at https://www2.hao.ucar.edu