Spatial relationships between region 2 field-aligned currents and electron and ion precipitation in the evening sector

Details Spatial relationships between region 2 field-aligned currents and electron and ion precipitation in the evening sector Spatial relationships between region 2 field-aligned currents and electron and ion precipitation in the evening sector

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9518939f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Nov. 1, 1990, p. 18939-18947.

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2

Electron Precipitation, Evening, Field Aligned Currents, Particle Precipitation, Polar Substorms, Spatial Distribution, Dynamics Explorer 2 Satellite, Earth Magnetosphere

Scientific paper

The equatorward cutoff of ion and electron precipitation in relation to the evening region 2 field-aligned current during isolated substorms has been investigated using the magnetic field and plasma data obtained from the Dynamics Explorer 2 satellite. The equatorward boundaries of the region 2 currents relative to those of central plasma sheet (CPS) electron precipitation are determined predominantly by magnetic local time and subsequently change with substorm phases. With approaching midnight, the equatorward boundary of CPS electron precipitation extends toward and eventually equatorward of that of the region 2 current. On the other hand, the equatorward boundary of the region 2 current coincides well with that of 10-20 keV ion precipitation during the whole course of substorms. It is proposed that these ions originate in the so-called Alfven layer and that the location of this inner boundary determines the lower latitude boundary of the region 2 current.

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