Physics – Plasma Physics
Scientific paper
Apr 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...102.7191o&link_type=abstract
Journal of Geophysical Research, Volume 102, Issue A4, p. 7191-7206
Physics
Plasma Physics
26
Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Auroral Phenomena, Magnetospheric Physics: Current Systems, Space Plasma Physics: Magnetic Reconnection
Scientific paper
A characteristic sequence of poleward moving auroral events and the associated ground magnetic deflections in the vicinity of cusp-type precipitation in the convection throat are studied. The occurrence, structure, and motion pattern of these events are found to be strongly regulated by the IMF Bz and By components. The present cases are observed in the prenoon sector during positive IMF By and negative Bz conditions. New, improved results on the dynamical structure of the magnetosphere-ionosphere current system of these events are obtained. The current system consists of a central filament or sheet-like field-aligned current (FAC), located on newly opened field lines with oppositely directed return currents on the poleward and equatorward sides. The ground magnetic deflections can be explained by ionospheric Hall currents generated by this FAC system and the associated pattern of ionospheric electric fields. The propagation speed of the events (auroral and magnetic signatures) are found to be comparable with the simultaneously observed antisunward convection speeds (1-2 km/s); that is, they are related to the tailward convection of newly opened magnetic flux. A qualitatively similar current system with opposite current polarity has recently been proposed for the corresponding auroral and magnetic signatures observed during negative IMF By conditions. The events are found to be consistent with an interpretation in terms of pulsed magnetopause reconnection, that is, flux transfer events.
Denig William F.
Lühr Hermann
Moretto Therese
Sandholt Per Even
Øieroset Marit
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