Latitudinal structures of nightside field-aligned currents and their relationships to the plasma sheet regions

Details Latitudinal structures of nightside field-aligned currents and their relationships to the plasma sheet regions Latitudinal structures of nightside field-aligned currents and their relationships to the plasma sheet regions

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9811235f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A7, p. 11,235-11,255.

Computer Science

Sound

36

Field Aligned Currents, Night Sky, Particle Precipitation, Plasma Layers, Satellite Sounding, Exos-D Satellite, Ion Distribution

Scientific paper

The magnetic field and low-energy particle data from the Akebono (EXOS D) satellite are used to study the latitudinal structures of field-aligned currents and auroral particles in the nightside auroral oval region for 12 Northern Hemisphere passes in the 20-04 MLT sector and at altitudes of 5000-10,000 km. The nightside field-aligned current system is found to consist of the latitudinally narrow (about 1 deg) current system located at the poleward boundary of the auroral oval and the latitudinally wide current system which occupies the main portion of the oval. It is suggested that both systems are located in the closed field line region, since the polar rain is observed just poleward of the boundary current system. It is also suggested that the boundary current system is independent of the traditional region 1 current system associated with inverted V electron precipitation, since suprathermal electrons with field-aligned pitch angle distributions are found to be the main charge carrier of this current system.

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