Spatial distribution of average vorticity in the high‐latitude ionosphere and its variation with interplanetary magnetic field direction and season
Identifieur interne : 001E91 ( Main/Exploration ); précédent : 001E90; suivant : 001E92Spatial distribution of average vorticity in the high‐latitude ionosphere and its variation with interplanetary magnetic field direction and season
Auteurs : G. Chisham [Royaume-Uni] ; M. P. Freeman [Royaume-Uni] ; G. A. Abel [Royaume-Uni] ; W. A. Bristow [États-Unis] ; A. Marchaudon [France] ; J. M. Ruohoniemi [États-Unis] ; G. J. Sofko [Canada]Source :
- [ 0148-0227 ]
Abstract
We present a technique to measure the magnetic field‐aligned vorticity of mesoscale plasma flows in the F region ionosphere using line‐of‐sight velocity measurements made by the Super Dual Auroral Radar Network (SuperDARN). Vorticity is often used as a proxy for magnetic field‐aligned current (FAC) intensity in the ionosphere but also provides information about turbulent processes in the ionosphere and magnetosphere. Using 6 years (2000–2005 inclusive) of vorticity measurements made by six SuperDARN radars in the Northern Hemisphere, we have compiled, for the first time, maps of average vorticity across the northern polar ionosphere. These maps have been subdivided according to different seasonal and interplanetary magnetic field (IMF) conditions. The variations in the morphology of the vorticity maps with IMF direction match very closely those seen in maps of average FAC intensity (determined using different methods and instrumentation), suggesting that vorticity is a good proxy for FAC in an averaged sense. The variations in the morphology of the vorticity maps with season show differences from those seen in the FAC maps, illustrating that ionospheric conductance plays a major role in determining the differences between measurements of vorticity and FAC.
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DOI: 10.1029/2009JA014263
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Marchaudon</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire de Physique et Chimie de l'Environnement et de l'Espace, CNRS, Orleans</wicri:regionArea><placeName><region type="region">Centre-Val de Loire</region><region type="old region">Région Centre</region><settlement type="city">Orléans</settlement></placeName></affiliation></author><author><name sortKey="Ruohoniemi, J M" sort="Ruohoniemi, J M" uniqKey="Ruohoniemi J" first="J. M." last="Ruohoniemi">J. M. Ruohoniemi</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, Virginia, Blacksburg</wicri:regionArea><wicri:noRegion>Blacksburg</wicri:noRegion></affiliation></author><author><name sortKey="Sofko, G J" sort="Sofko, G J" uniqKey="Sofko G" first="G. J." last="Sofko">G. J. Sofko</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Physics, University of Saskatchewan, Saskatoon, Saskatchewan</wicri:regionArea><wicri:noRegion>Saskatchewan</wicri:noRegion></affiliation></author></analytic><series><idno type="ISSN">0148-0227</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0148-0227</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract">We present a technique to measure the magnetic field‐aligned vorticity of mesoscale plasma flows in the F region ionosphere using line‐of‐sight velocity measurements made by the Super Dual Auroral Radar Network (SuperDARN). Vorticity is often used as a proxy for magnetic field‐aligned current (FAC) intensity in the ionosphere but also provides information about turbulent processes in the ionosphere and magnetosphere. Using 6 years (2000–2005 inclusive) of vorticity measurements made by six SuperDARN radars in the Northern Hemisphere, we have compiled, for the first time, maps of average vorticity across the northern polar ionosphere. These maps have been subdivided according to different seasonal and interplanetary magnetic field (IMF) conditions. The variations in the morphology of the vorticity maps with IMF direction match very closely those seen in maps of average FAC intensity (determined using different methods and instrumentation), suggesting that vorticity is a good proxy for FAC in an averaged sense. The variations in the morphology of the vorticity maps with season show differences from those seen in the FAC maps, illustrating that ionospheric conductance plays a major role in determining the differences between measurements of vorticity and FAC.</div></front></TEI><affiliations><list><country><li>Canada</li><li>France</li><li>Royaume-Uni</li><li>États-Unis</li></country><region><li>Centre-Val de Loire</li><li>Région Centre</li></region><settlement><li>Orléans</li></settlement></list><tree><country name="Royaume-Uni"><noRegion><name sortKey="Chisham, G" sort="Chisham, G" uniqKey="Chisham G" first="G." last="Chisham">G. Chisham</name></noRegion><name sortKey="Abel, G A" sort="Abel, G A" uniqKey="Abel G" first="G. A." last="Abel">G. A. Abel</name><name sortKey="Chisham, G" sort="Chisham, G" uniqKey="Chisham G" first="G." last="Chisham">G. Chisham</name><name sortKey="Freeman, M P" sort="Freeman, M P" uniqKey="Freeman M" first="M. P." last="Freeman">M. P. 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