Field-aligned current reconfiguration and magnetospheric response to an impulse in the interplanetary magnetic field B-Y component

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dc.contributorVirginia Techen
dc.contributor.authorWilder, F. D.en
dc.contributor.authorEriksson, S.en
dc.contributor.authorKorth, H.en
dc.contributor.authorBaker, Joseph B. H.en
dc.contributor.authorHairston, M. R.en
dc.contributor.authorHeinselman, C.en
dc.contributor.authorAnderson, B. J.en
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessed2013-11-20en
dc.date.accessioned2013-12-02T18:12:00Zen
dc.date.available2013-12-02T18:12:00Zen
dc.date.issued2013-06-16en
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
dc.description.sponsorshipNational Science Foundation AGS-1144154,ATM-0739864,ATM-0946900,AGS-1150789,AGS-0836152en
dc.description.sponsorshipNASA under LWS NNX07AT18Gen
dc.format.mimetypeapplication/pdfen
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
dc.identifier.doihttps://doi.org/10.1002/grl.50505en
dc.identifier.issn0094-8276en
dc.identifier.urihttp://hdl.handle.net/10919/24275en
dc.language.isoenen
dc.publisherAmerican Geophysical Unionen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectPolar capen
dc.subjectIonosphereen
dc.subjectMI couplingen
dc.subjectAmperesen
dc.subjectField-aligned currentsen
dc.subjectConvectionen
dc.titleField-aligned current reconfiguration and magnetospheric response to an impulse in the interplanetary magnetic field B-Y componenten
dc.title.serialGeophysical Research Lettersen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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