Satellite and ground observations of a pre-substorm phase on May 4, 1977

Details Satellite and ground observations of a pre-substorm phase on May 4, 1977 Satellite and ground observations of a pre-substorm phase on May 4, 1977

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.4097r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, May 1, 1983, p. 4097-4104.

Physics

5

Electron Precipitation, Energetic Particles, Magnetic Storms, Plasma Layers, Satellite Observation, Angular Distribution, Electron Scattering, Ground Stations, Trapped Particles

Scientific paper

On May 4, 1977, a polar orbiting low-altitude DMSP satellite passed close to the Finnish riometer stations at the same time as an absorption bay preceding an onset of substorm was observed. The combined ground and satellite measurements show that the absorption bay was characterized by intense precipitation of energetic electrons at the inner border of the compressed plasma sheet. The precipitation occurred in a narrow band of latitude, perhaps less than 50 km wide. We suggest that the pre-bay precipitation was due to strong pitch angle diffusion and/or scatter of energetic electrons at the inner border of the plasma sheet, probably from the outer radiation zone.

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