Show simple item record

dc.contributorVirginia Techen_US
dc.contributor.authorWilder, F. D.en_US
dc.contributor.authorEriksson, S.en_US
dc.contributor.authorKorth, H.en_US
dc.contributor.authorBaker, Joseph B. H.en_US
dc.contributor.authorHairston, M. R.en_US
dc.contributor.authorHeinselman, C.en_US
dc.contributor.authorAnderson, B. J.en_US
dc.date.accessioned2013-12-02T18:12:00Z
dc.date.available2013-12-02T18:12:00Z
dc.date.issued2013-06-16
dc.identifier.citationWilder, F. D., S. Eriksson, H. Korth, J. B. H. Baker, M. R. Hairston, C. Heinselman, and B. J. Anderson (2013), Field-aligned current reconfiguration and magnetospheric response to an impulse in the interplanetary magnetic field BY component, Geophys. Res. Lett., 40, 2489–2494, doi:10.1002/grl.50505en_US
dc.identifier.issn0094-8276
dc.identifier.urihttp://hdl.handle.net/10919/24275
dc.description.abstractWhen the interplanetary magnetic field (IMF) is dawnward or duskward, magnetic merging between the IMF and the geomagnetic field occurs near the cusp on the dayside flanks of the magnetosphere. During these intervals, flow channels in the ionosphere with velocities in excess of 2km/s have been observed, which can deposit large amounts of energy into the high-latitude thermosphere. In this study, we analyze an interval on 5 April 2010 where there was a strong dawnward impulse in the IMF, followed by a gradual decay in IMF magnitude at constant clock angle. Data from the Sondrestrom incoherent scatter radar and the Defense Meteorological Satellite Program spacecraft were used to investigate ionospheric convection during this interval, and data from the Active Magnetospheric and Planetary Electrodynamics Response Experiment (AMPERE) were used to investigate the associated Field-Aligned Current (FAC) system. Additionally, data from AMPERE were used to investigate the time response of the dawnside FAC pair. We find there is a delay of approximately 1.25h between the arrival of the dawnward IMF impulse at the magnetopause and strength of the dawnward FAC pair, which is comparable to substorm growth and expansion time scales under southward IMF. Additionally, we find at the time of the peak FAC, there is evidence of a reconfiguring four-sheet FAC system in the morning local time sector of the ionosphere. Additionally, we find an inverse correlation between the dawn FAC strength and both the solar wind Alfvenic Mach number and the SYM-H index. No statistically significant correlation between the FAC strength and the solar wind dynamic pressure was found.en_US
dc.description.sponsorshipNational Science Foundation AGS-1144154,ATM-0739864,ATM-0946900,AGS-1150789,AGS-0836152
dc.description.sponsorshipNASA under LWS NNX07AT18G
dc.format.mimetypeapplication/pdfen_US
dc.language.isoen_US
dc.publisherAmerican Geophysical Union
dc.subjectPolar capen_US
dc.subjectIonosphereen_US
dc.subjectMI couplingen_US
dc.subjectAmperesen_US
dc.subjectField-aligned currentsen_US
dc.subjectConvectionen_US
dc.titleField-aligned current reconfiguration and magnetospheric response to an impulse in the interplanetary magnetic field B-Y componenten_US
dc.typeArticle - Refereeden_US
dc.date.accessed2013-11-20
dc.title.serialGeophysical Research Letters
dc.identifier.doihttps://doi.org/10.1002/grl.50505
dc.type.dcmitypeTexten_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record