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Electrodynamics of the high‐latitude trough: Its relationship with convection flows and field‐aligned currents

dc.contributor.authorZou, Shashaen_US
dc.contributor.authorMoldwin, Mark B.en_US
dc.contributor.authorNicolls, Michael J.en_US
dc.contributor.authorRidley, Aaron J.en_US
dc.contributor.authorCoster, Anthea J.en_US
dc.contributor.authorYizengaw, Endawokeen_US
dc.contributor.authorLyons, Larry R.en_US
dc.contributor.authorDonovan, Eric F.en_US
dc.date.accessioned2013-07-08T17:45:45Z
dc.date.available2014-07-01T15:53:39Zen_US
dc.date.issued2013-05en_US
dc.identifier.citationZou, Shasha; Moldwin, Mark B.; Nicolls, Michael J.; Ridley, Aaron J.; Coster, Anthea J.; Yizengaw, Endawoke; Lyons, Larry R.; Donovan, Eric F. (2013). "Electrodynamics of the high‐latitude trough: Its relationship with convection flows and field‐aligned currents." Journal of Geophysical Research: Space Physics 118(5): 2565-2572. <http://hdl.handle.net/2027.42/98817>en_US
dc.identifier.issn2169-9380en_US
dc.identifier.issn2169-9402en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/98817
dc.description.abstractWe present a detailed case study of the electrodynamics of a high‐latitude trough observed at ~ 12 UT (~1 MLT) on 8 March 2008 using multiple instruments, including incoherent scattering radar (ISR), GPS total electron content (TEC), magnetometers, and auroral imager. The electron density within the trough dropped as much as 80% within 6 minutes. This trough was collocated with a counterclockwise convection flow vortex, indicating divergent horizontal electric fields and currents. Together with a collocated dark area shown in auroral images, the observations provide strong evidence for an existence of downward field‐aligned currents (FACs) collocated with the high‐latitude trough. This is further supported by assimilative mapping of ionospheric electrodynamics results. In addition, the downward FACs formed at about the same time as a substorm onset and east of the Harang reversal, suggesting it is part of the substorm current wedge. It has long been a puzzle why this type of high‐latitude trough predominantly occurs just east of the Harang reversal in the postmidnight sector. We suggest that the high‐latitude trough is associated with the formation of downward FACs of the substorm current system, which usually occur just east of the Harang reversal. In addition, we find that the ionospheric electron temperature within the high latitude trough decreases in the F region while increasing in the E region. We discuss possible mechanisms responsible for the complex change in electron temperature, such as ion composition change and/or presence of downward FACs. Key Points Multi‐instrument study of the high‐latitude trough electrodynamics Trough is associated with anti‐clockwise flow vortex and substorm downward FACs Complex Te profile observed in the trough and due to downward FACsen_US
dc.publisherUniv. of Calgaryen_US
dc.publisherWiley Periodicals, Inc.en_US
dc.subject.otherHarang Reversalen_US
dc.subject.otherField‐Aligned Currenten_US
dc.subject.otherIonospheric Convectionen_US
dc.subject.otherSubstormen_US
dc.subject.otherIonospheric Troughen_US
dc.subject.otherIonospheric Plasma Temperaturemen_US
dc.titleElectrodynamics of the high‐latitude trough: Its relationship with convection flows and field‐aligned currentsen_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/2027.42/98817/1/jgra50120.pdf
dc.identifier.doi10.1002/jgra.50120en_US
dc.identifier.sourceJournal of Geophysical Research: Space Physicsen_US
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dc.owningcollnameInterdisciplinary and Peer-Reviewed


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