Penetration Electric Fields and Magnetospheric Convection During the April 2002 Storm

Details Penetration Electric Fields and Magnetospheric Convection During the April 2002 Storm Penetration Electric Fields and Magnetospheric Convection During the April 2002 Storm

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa12a..09a&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA12A-09

Physics

2411 Electric Fields (2712), 2431 Ionosphere/Magnetosphere Interactions (2736), 2463 Plasma Convection, 2712 Electric Fields (2411), 2788 Storms And Substorms

Scientific paper

We present measurements of the cross-polar-cap potential drop and the extent and magnitude of the electric field penetration during the April 2002 storm, provided by ion drift measurements on three DMSP spacecraft. The cross-polar-cap potential drop exceeded 150 kV on four occasions near Dst minima on April 17, 18, 19, and 20. In the absence of significant shielding near the inner edge of the ring current, measurable electric field penetration to low L-values was observed, maximizing near the Dst minima. The auroral oval reached a minimum magnetic latitude near 50 degrees while substantial electric fields penetrated to below 40 degrees magnetic latitude. The potential drop equatorward/earthward of the auroral oval/electron plasma sheet was a sizable fraction of the total potential drop across the polar cap/magnetosphere during the main and early recovery phases of the storms, at times exceeding 60 kV. We discuss these results and their implications of the formation and decay of the storm time ring current.

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