Extreme energetic particle decreases near geostationary orbit - A manifestation of current diversion within the inner plasma sheet

Details Extreme energetic particle decreases near geostationary orbit - A manifestation of current diversion within the inner plasma sheet Extreme energetic particle decreases near geostationary orbit - A manifestation of current diversion within the inner plasma sheet

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.6591b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, May 1, 1990, p. 6591-6599. Research supported by DOE.

Physics

108

Energetic Particles, Magnetic Field Configurations, Magnetic Storms, Plasma Currents, Space Plasmas, Synchronous Satellites, Earth Magnetosphere, Electron Precipitation, Geomagnetic Tail, Ionospheric Conductivity, Plasma Layers

Scientific paper

A qualitative model of magnetic field reconfiguration as might result from neutral line formation in the central plasma sheet late in a substorm growth phase is considered. It is suggested that magnetic reconnection probably begins before the substorm expansion phase and that cross-tail current is enhanced across the plasma sheet both earthward and tailward of a limited region near the neutral line. Such an enhanced cross-tail current earthward of the original X line region may contribute to thinning the plasma sheet substantially, and this would in turn affect the drift currents in that location, thus enhancing the current even closer toward the earth. In this way a redistribution and progressive diversion of normal cross-tail current throughout much of the inner portion of the plasma sheet could occur. The resulting intensified current, localized at the inner edge of the plasma sheet, would lead to a very thin plasma confinement region. This would explain the very taillike field and extreme particle dropouts often seen late in substorm growth phases.

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