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Strong ionospheric field‐aligned currents for radial interplanetary magnetic fields

dc.contributor.authorWang, Huien_US
dc.contributor.authorLühr, Hermannen_US
dc.contributor.authorShue, Jih‐hongen_US
dc.contributor.authorFrey, Harald. U.en_US
dc.contributor.authorKervalishvili, Guramen_US
dc.contributor.authorHuang, Taoen_US
dc.contributor.authorCao, Xueen_US
dc.contributor.authorPi, Gilberten_US
dc.contributor.authorRidley, Aaron J.en_US
dc.date.accessioned2014-07-03T14:41:36Z
dc.date.availableWITHHELD_11_MONTHSen_US
dc.date.available2014-07-03T14:41:36Z
dc.date.issued2014-05en_US
dc.identifier.citationWang, Hui; Lühr, Hermann ; Shue, Jih‐hong ; Frey, Harald. U.; Kervalishvili, Guram; Huang, Tao; Cao, Xue; Pi, Gilbert; Ridley, Aaron J. (2014). "Strong ionospheric fieldâ aligned currents for radial interplanetary magnetic fields." Journal of Geophysical Research: Space Physics 119(5): 3979-3995.en_US
dc.identifier.issn2169-9380en_US
dc.identifier.issn2169-9402en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/107563
dc.description.abstractThe present work has investigated the configuration of field‐aligned currents (FACs) during a long period of radial interplanetary magnetic field (IMF) on 19 May 2002 by using high‐resolution and precise vector magnetic field measurements of CHAMP satellite. During the interest period IMF B y and B z are weakly positive and B x keeps pointing to the Earth for almost 10 h. The geomagnetic indices D s t is about −40 nT and AE about 100 nT on average. The cross polar cap potential calculated from Assimilative Mapping of Ionospheric Electrodynamics and derived from DMSP observations have average values of 10–20 kV. Obvious hemispheric differences are shown in the configurations of FACs on the dayside and nightside. At the south pole FACs diminish in intensity to magnitudes of about 0.1 μA/m 2 , the plasma convection maintains two‐cell flow pattern, and the thermospheric density is quite low. However, there are obvious activities in the northern cusp region. One pair of FACs with a downward leg toward the pole and upward leg on the equatorward side emerge in the northern cusp region, exhibiting opposite polarity to FACs typical for duskward IMF orientation. An obvious sunward plasma flow channel persists during the whole period. These ionospheric features might be manifestations of an efficient magnetic reconnection process occurring in the northern magnetospheric flanks at high latitude. The enhanced ionospheric current systems might deposit large amount of Joule heating into the thermosphere. The air densities in the cusp region get enhanced and subsequently propagate equatorward on the dayside. Although geomagnetic indices during the radial IMF indicate low‐level activity, the present study demonstrates that there are prevailing energy inputs from the magnetosphere to both the ionosphere and thermosphere in the northern polar cusp region. Key Points A pair of strong FACs emerges with opposite polarity to DPY FACs Obvious sunward plasma flow channel persists during the period Enhanced air densities are found in the cusp regionen_US
dc.publisherAGUen_US
dc.publisherWiley Periodicals, Inc.en_US
dc.subject.otherField‐Aligned Currentsen_US
dc.subject.otherRadial Interplanetary Magnetic Fielden_US
dc.subject.otherAir Upwellingen_US
dc.titleStrong ionospheric field‐aligned currents for radial interplanetary magnetic fieldsen_US
dc.typeArticleen_US
dc.rights.robotsIndexNoFollowen_US
dc.subject.hlbsecondlevelAstronomy and Astrophysicsen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/107563/1/jgra51028.pdf
dc.identifier.doi10.1002/2014JA019951en_US
dc.identifier.sourceJournal of Geophysical Research: Space Physicsen_US
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dc.owningcollnameInterdisciplinary and Peer-Reviewed


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