Physics
Scientific paper
Jul 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..689r&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 14, July 1987, p. 689-692.
Physics
29
Dmsp Satellites, Electric Current, Electron Precipitation, Field Aligned Currents, Geomagnetism, Interplanetary Magnetic Fields, Solar Wind, Auroral Zones, Earth Ionosphere, Earth Magnetosphere, Magnetopause, Polar Regions
Scientific paper
Magnetic field and precipitating particle data from the DMSP/F7 satellite are used to study the 'quiet auroral zone/quiet polar cap' state of the magnetosphere/ionosphere system. Such a quiet state is found to occur when the IMF Bz is near zero or northward for an extended period and when the solar wind velocity is low. The large-scale Region 1/Region 2 field-aligned current (FAC) system disappears, and small-scale FACs are observed in the auroral oval. The cleft FAC continues almost without change, and the diffuse auroral precipitation continues at a low level. The polar cap is a small region confined almost entirely to the nightside and is characterized by polar rain and no FACs. A slight change in activity can cause the reappearance of a weak Region 1/Region 2 FAC system, which may last for less than 50 min.
Gussenhoven Susan M.
Rich Frederick J.
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