Postmidnight convection dynamics during substorm expansion phase
Identifieur interne : 002809 ( Main/Exploration ); précédent : 002808; suivant : 002810Postmidnight convection dynamics during substorm expansion phase
Auteurs : Jun Liang [Canada] ; G. J. Sofko [Canada] ; H. U. Frey [États-Unis]Source :
- Journal of Geophysical Research: Space Physics [ 0148-0227 ] ; 2006-04.
Abstract
A study of the dynamics of ionospheric plasma convection in the postmidnight sector during the substorm expansion phase (EP) is presented. We have found that after the substorm onset, a postmidnight anticlockwise convection vortex (PoACV) usually emerges at latitudes higher than the auroral brightening region, and an east‐to‐west flow reversal wrapping around the intensified auroras extends into the postmidnight sector. The substorm current system inferred from the relative positions of the PoACV and the auroral brightening region is in general northeast‐southwest aligned, implying a mixture of a meridional current system (MCS) and a zonal system associated with the substorm current wedge (SCW). The time delay between the formation of the PoACV and the onset depends upon the relative azimuthal location of the PoACV and the auroral brightening region. The observed postmidnight convection pattern, namely, a PoACV at higher latitudes, and an east‐to‐west flow reversal region at lower latitudes, can be explained by a combination of the nightside reconnection and the “field line slippage” process associated with dipolarization. Finally, we suggest that strong negative IMF By is the most unfavorable condition for the evolution of the PoACV.
Url:
DOI: 10.1029/2005JA011483
Affiliations:
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Frey</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:B74E19A2A0B0678CBBD61F35908F0ED796D7C37C</idno><date when="2006" year="2006">2006</date><idno type="doi">10.1029/2005JA011483</idno><idno type="url">https://api-v5.istex.fr/document/B74E19A2A0B0678CBBD61F35908F0ED796D7C37C/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001249</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">001249</idno><idno type="wicri:Area/Istex/Curation">001249</idno><idno type="wicri:Area/Istex/Checkpoint">000B52</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Checkpoint">000B52</idno><idno type="wicri:doubleKey">0148-0227:2006:Liang J:postmidnight:convection:dynamics</idno><idno type="wicri:Area/Main/Merge">002A96</idno><idno type="wicri:Area/Main/Curation">002809</idno><idno type="wicri:Area/Main/Exploration">002809</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Postmidnight convection dynamics during substorm expansion phase</title><author><name sortKey="Liang, Jun" sort="Liang, Jun" uniqKey="Liang J" first="Jun" last="Liang">Jun Liang</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Institute of Space and Atmospheric Studies, Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan</wicri:regionArea><wicri:noRegion>Saskatchewan</wicri:noRegion></affiliation><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Now at Canadian Space Agency, Saint‐Hubert, Québec</wicri:regionArea><wicri:noRegion>Québec</wicri:noRegion></affiliation><affiliation wicri:level="1"><country wicri:rule="url">Canada</country></affiliation></author><author><name sortKey="Sofko, G J" sort="Sofko, G J" uniqKey="Sofko G" first="G. 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Res.</title><idno type="ISSN">0148-0227</idno><idno type="eISSN">2156-2202</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2006-04">2006-04</date><biblScope unit="volume">111</biblScope><biblScope unit="issue">A4</biblScope><biblScope unit="page" from="/">n/a</biblScope><biblScope unit="page" to="/">n/a</biblScope></imprint><idno type="ISSN">0148-0227</idno></series><idno type="istex">B74E19A2A0B0678CBBD61F35908F0ED796D7C37C</idno><idno type="DOI">10.1029/2005JA011483</idno><idno type="ArticleID">2005JA011483</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0148-0227</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">A study of the dynamics of ionospheric plasma convection in the postmidnight sector during the substorm expansion phase (EP) is presented. We have found that after the substorm onset, a postmidnight anticlockwise convection vortex (PoACV) usually emerges at latitudes higher than the auroral brightening region, and an east‐to‐west flow reversal wrapping around the intensified auroras extends into the postmidnight sector. The substorm current system inferred from the relative positions of the PoACV and the auroral brightening region is in general northeast‐southwest aligned, implying a mixture of a meridional current system (MCS) and a zonal system associated with the substorm current wedge (SCW). The time delay between the formation of the PoACV and the onset depends upon the relative azimuthal location of the PoACV and the auroral brightening region. The observed postmidnight convection pattern, namely, a PoACV at higher latitudes, and an east‐to‐west flow reversal region at lower latitudes, can be explained by a combination of the nightside reconnection and the “field line slippage” process associated with dipolarization. Finally, we suggest that strong negative IMF By is the most unfavorable condition for the evolution of the PoACV.</div></front></TEI><affiliations><list><country><li>Canada</li><li>États-Unis</li></country><region><li>Californie</li></region><settlement><li>Berkeley (Californie)</li></settlement></list><tree><country name="Canada"><noRegion><name sortKey="Liang, Jun" sort="Liang, Jun" uniqKey="Liang J" first="Jun" last="Liang">Jun Liang</name></noRegion><name sortKey="Liang, Jun" sort="Liang, Jun" uniqKey="Liang J" first="Jun" last="Liang">Jun Liang</name><name sortKey="Liang, Jun" sort="Liang, Jun" uniqKey="Liang J" first="Jun" last="Liang">Jun Liang</name><name sortKey="Sofko, G J" sort="Sofko, G J" uniqKey="Sofko G" first="G. J." last="Sofko">G. J. Sofko</name></country><country name="États-Unis"><region name="Californie"><name sortKey="Frey, H U" sort="Frey, H U" uniqKey="Frey H" first="H. U." last="Frey">H. U. 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