Anna Malanushenko https://www2.hao.ucar.edu/ en Designing a New Coronal Magnetic Field Energy Diagnostic https://www2.hao.ucar.edu/news/publication-highlight/designing-new-coronal-magnetic-field-energy-diagnostic <span class="field field--name-title field--type-string field--label-hidden">Designing a New Coronal Magnetic Field Energy Diagnostic</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/6" typeof="schema:Person" property="schema:name" datatype="">whawkins</span></span> <span class="field field--name-created field--type-created field--label-hidden">Wed, 08/31/2022 - 13:43</span> <div class="layout__region--twocol d-grid d-print-flex with-sidebar"> <div class="layout__region layout__region--main-top breadcrumb-wrapper mt-2"> <div class="block block-system block-system-breadcrumb-block"> <nav class="mb-2 d-print-none" role="navigation" aria-labelledby="system-breadcrumb"> <h2 id="system-breadcrumb" class="visually-hidden">Breadcrumb</h2> <ol class="breadcrumb"> <li class="breadcrumb-item"> <a href="/">Home</a> </li> <li class="breadcrumb-item"> <a href="/taxonomy/term/54">Anna Malanushenko</a> </li> </ol> </nav> </div> </div> <main class="layout__region layout__region--main main-content-wrapper"> <div class="block block-layout-builder block-extra-field-blocknodearticleauthor-and-created"> <div class="author_created row gx-0"> <div class="col"> <div class="fw-bold fs-6">Author:</div> <div class="author_created__name fs-6">whawkins</div> <div class="author_created__date text-gray-dark fs-6">Aug 31, 2022</div> </div> </div> </div> <div class="mt-3 mt-md-4 block block-layout-builder block-field-blocknodearticlefield-main-content"> <div class="field field--name-field-main-content field--type-entity-reference-revisions field--label-hidden field__items"> <div class="field__item"> <div class="paragraph paragraph--type--rich-text paragraph--view-mode--default"> <div class="clearfix text-formatted field field--name-field-body field--type-text-long field--label-hidden field__item"><p>In the solar corona, the free energy, i.e., the excess in magnetic energy over a ground-state potential field, forms the reservoir of energy that can be released during solar flares and coronal mass ejections. Such a free energy further provides a measure of non-potentiality of the magnetic field. Recent theoretical studies indicate that the presence of non-potential magnetic fields is imprinted into the structures of infrared, off-limb, coronal polarization. Thanks to the Coronal Multichannel Polarimeter, coronal linear polarization observations are now available on a daily basis and have been demonstrated to be useful for diagnosing properties of the coronal magnetic field. Future telescopes such as the Daniel K. Inouye Solar Telescope and the proposed Coronal Solar Magnetism Observatory Large Coronagraph will yield circular polarization measurements in the corona. In this paper, we investigate the possibility of exploiting such observations for mapping and studying the accumulation and release of coronal free magnetic energy, with the goal of developing a new tool for identifying "hot spots" of coronal free energy such as those associated with twisted and/or sheared coronal magnetic fields. We applied forward modeling of infrared coronal polarimetry to three-dimensional models of non-potential and potential magnetic fields. From these we defined a diagnostic of non-potentiality that in future could be calculated from a comparison of infrared, o-limb, coronal polarization observations and the corresponding polarization signal forward-modeled from a potential field extrapolated from photospheric magnetograms. We considered the relative diagnostic potential of linear and circular polarization, and the sensitivities of these diagnostics to coronal density distributions and assumed boundary conditions of the potential field. Our work confirms the capacity of polarization measurements for diagnosing non-potentiality and free energy in the solar corona.</p> <figure class="media media--type-image media--view-mode-default figure mb-1 mb-md-4"> <p> <img src="/sites/default/files/styles/extra_large/public/2022-08/Gibson_energizedFlux-rope.png?itok=iBKNtOp0" width="926" height="235" alt="Non-potentiality diagnostics of the energized flux-rope simulation at time step 89" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>Non-potentiality diagnostics of the energized flux-rope simulation at time step 89, computed from the fraction of circular polarization, V/I, using a potential field source surface simulation as reference.  First column: V/I two-dimensional map forward modeled from the flux-rope simulation. Second  column: V/I map  forward modeled from the potential  field. Third  column:  non-potentiality map  (squared difference between energized flux-rope simulation V/I and potential field V/I). Fourth column:  two-dimensional map column density integral of non-potential energy calculated from difference of the ground-truth simulation magnetic energy and the potential field magnetic energy. Green lines represent. the POS direction of the magnetic field.  Solid yellow line indicates the surface of the Sun.</p> </figcaption> </figure> <p><em><a href="https://ui.adsabs.harvard.edu/abs/2021ApJ...907...23C/abstract">The Astrophysical Journal (abstract)</a></em></p> </div> </div> </div> </div> </div> <div class="views-element-container block block-views block-views-blockarticles-recent-news"> <h2 class="mb-md-2">Recent News</h2> <div><div class="view view-articles view-id-articles view-display-id-recent_news js-view-dom-id-9e852511fc22b9ed8de1e2feb39c476c2632ab9e1a7a6ce9b049ffcf2b0f9409"> <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="2022-08-31T12:00:00Z" class="datetime">Wed, 08/31/2022 - 12:00</time> </div> </div> </div> </main> <aside class="layout__region layout__region--sidebar resources-wrapper d-print-none"> <div class="block block-layout-builder block-field-blocknodearticlefield-article-tags"> <div class="resources-wrapper d-print-none"> <div class="resources related mb-4"> <h2 class="p-2 px-md-3">Tags</h2> <div class="p-2 px-md-3 py-md-3"> <a href="/taxonomy/term/54" hreflang="en">Anna Malanushenko</a>, <a href="/taxonomy/term/15" hreflang="en">Sarah Gibson</a>, <a href="/taxonomy/term/26" hreflang="en">Yuhong Fan</a>, <a href="/taxonomy/term/14" hreflang="en">solar magnetism</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Wed, 31 Aug 2022 19:43:18 +0000 whawkins 689 at https://www2.hao.ucar.edu The Coronal Veil https://www2.hao.ucar.edu/news/publication-highlight/coronal-veil <span class="field field--name-title field--type-string field--label-hidden">The Coronal Veil</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 - 14:15</span> <div class="layout__region--twocol d-grid d-print-flex with-sidebar"> <div class="layout__region layout__region--main-top breadcrumb-wrapper mt-2"> <div class="block block-system block-system-breadcrumb-block"> <nav class="mb-2 d-print-none" role="navigation" aria-labelledby="system-breadcrumb"> <h2 id="system-breadcrumb" class="visually-hidden">Breadcrumb</h2> <ol class="breadcrumb"> <li class="breadcrumb-item"> <a href="/">Home</a> </li> <li class="breadcrumb-item"> <a href="/taxonomy/term/54">Anna Malanushenko</a> </li> </ol> </nav> </div> </div> <main class="layout__region layout__region--main main-content-wrapper"> <div class="block block-layout-builder block-field-blocknodearticlefield-subtitle"> <p class="field field--name-field-subtitle field--type-string field--label-above mb-4 mt-n4">Publication: Astrophysical Journal; Authors: Malanushenko, A.; Cheung, M. C. M.; DeForest, C. E.; Klimchuk, J. A.; Rempel, M.</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/AnnaM_simulatedCorona.png?itok=dLZZskbD" width="926" height="571" alt="3D view of the simulated corona; bottom panel: magnetogram; back panel: synthetic AIA 211A coronal image; middle vertical plane: volumetric emissivity. Field lines are included for reference." loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>3D view of the simulated corona; bottom panel: magnetogram; back panel: synthetic AIA 211A coronal image; middle vertical plane: volumetric emissivity. Field lines are included for reference.</p> </figcaption> </figure> <p>Coronal loops, seen in solar coronal images, are believed to represent emission from magnetic flux tubes with compact cross sections. We examine the 3D structure of plasma above an active region in a radiative magnetohydrodynamic simulation to locate volume counterparts for coronal loops. In many cases, a loop cannot be linked to an individual thin strand in the volume. While many thin loops are present in the synthetic images, the bright structures in the volume are fewer and of complex shape. We demonstrate that this complexity can form impressions of thin bright loops, even in the absence of thin bright plasma strands. We demonstrate the difficulty of discerning from observations whether a particular loop corresponds to a strand in the volume, or a projection artifact. We demonstrate how apparently isolated loops could deceive observers, even when observations from multiple viewing angles are available. While we base our analysis on a simulation, the main findings are independent from a particular simulation setup and illustrate the intrinsic complexity involved in interpreting observations resulting from line-of-sight integration in an optically thin plasma. We propose alternative interpretation for strands seen in Extreme Ultraviolet images of the corona. The "coronal veil" hypothesis is mathematically more generic, and naturally explains properties of loops that are difficult to address otherwise-such as their constant cross section and anomalously high density scale height. We challenge the paradigm of coronal loops as thin magnetic flux tubes, offering new understanding of solar corona, and by extension, of other magnetically confined bright hot plasmas.</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-26fc3f173b37acf3500205f5d71af0e38733f61578bb522ea8da94a18b15be0d"> <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="2022-06-22T12:00:00Z" class="datetime">Wed, 06/22/2022 - 12:00</time> </div> </div> </div> </main> <aside class="layout__region layout__region--sidebar resources-wrapper d-print-none"> <div class="block block-layout-builder block-field-blocknodearticlefield-article-tags"> <div class="resources-wrapper d-print-none"> <div class="resources related mb-4"> <h2 class="p-2 px-md-3">Tags</h2> <div class="p-2 px-md-3 py-md-3"> <a href="/taxonomy/term/54" hreflang="en">Anna Malanushenko</a>, <a href="/taxonomy/term/45" hreflang="en">Matthias Rempel</a>, <a href="/taxonomy/term/3" hreflang="en">corona</a>, <a href="/taxonomy/term/57" hreflang="en">MHD</a>, <a href="/taxonomy/term/14" hreflang="en">solar magnetism</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Mon, 11 Jul 2022 20:15:00 +0000 kolinski 593 at https://www2.hao.ucar.edu Convolutional Neural Networks for Predicting the strength of the Near-Earth Magnetic Field Caused by Interplanetary Coronal Mass Ejections https://www2.hao.ucar.edu/news/publication-highlight/convolutional-neural-networks-predicting-strength-near-earth-magnetic <span class="field field--name-title field--type-string field--label-hidden">Convolutional Neural Networks for Predicting the strength of the Near-Earth Magnetic Field Caused by Interplanetary Coronal Mass Ejections</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 - 09:26</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/54">Anna Malanushenko</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: Frontiers in Astronomy; Authors names as they are listed in article: Anna Malanushenko, Natasha Flyer, Sarah Gibson</p> </div> <div class="block block-layout-builder block-extra-field-blocknodearticleauthor-and-created"> <div class="author_created row gx-0"> <div class="col"> <div class="fw-bold fs-6">Author:</div> <div class="author_created__name fs-6">kolinski</div> <div class="author_created__date text-gray-dark fs-6">Nov 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>In this paper, regression-based deep convolutional neural networks (CNN), with 12 layers, are developed for predicting the maximal amplitude of the southward component of the near-Earth magnetic field from a passing interplanetary coronal mass ejection (ICME). The input to the CNN is the Gibson and Low (GLOW) flux rope model (Gibson and Low, 1998) that describes the coronal properties of a CME, where its morphology and position is controlled by 5 varying parameters, i.e. input sampling occurs over a 5D parameter space. The ultimate goal is to determine the extent to which coronal spectropolarimetric observations at the Sun encode sufficient information to predict southward magnetic field component at the Earth.</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/AnnaM_FluxRope.png?itok=iTjTLJVE" width="926" height="620" alt="Examples of various initial GLOW configurations" loading="lazy" typeof="foaf:Image" class="image-style-extra-large img-fluid" /></p> <figcaption class="figure-caption pb-1"> <p>Examples of various initial GLOW configurations. Blue and green lines are magnetic field lines sampling the magnetic structure of the GLOW spheromak, shown here with different combinations of parameters for angular size, topology, orientation. Solar surface is shown in thin black lines for reference.</p> </figcaption> </figure> <p>The GLOW model is used as a first simple test of a self-similarly expanding magnetic flux rope which nevertheless allows consideration of the impact of varying CME location, orientation, size, and morphology. The CNN problem is set up in two experiments: 1) given input data near the Sun, three 2D images in the meridional plane of the components of the magnetic field, predict the maximal southward amplitude of the measured magnetic field at the Earth; 2) given line-of-sight integrated images of the Stokes parameters, corresponding to the physical configurations of the over 30K flux ropes from Part 1, predict the maximal southward amplitude of the measured magnetic field at the Earth.</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-714638b66e3521d7ab731aa8b2d45a21dc6314dc5acc6319c3cfcee2852d56be"> <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 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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="2020-07-09T12:00:00Z" class="datetime">Thu, 07/09/2020 - 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/54" hreflang="en">Anna Malanushenko</a>, <a href="/taxonomy/term/55" hreflang="en">CME</a>, <a href="/taxonomy/term/53" hreflang="en">GLOW</a>, <a href="/taxonomy/term/2" hreflang="en">magnetosphere</a>, <a href="/taxonomy/term/13" hreflang="en">modeling</a> </div> </div> </div> </div> </aside> </div> <div class="layout layout--onecol"> <div > </div> </div> Wed, 17 Nov 2021 16:26:43 +0000 kolinski 57 at https://www2.hao.ucar.edu