Counter-streaming electrons at the geomagnetic equator near 9 earth radii

Details Counter-streaming electrons at the geomagnetic equator near 9 earth radii Counter-streaming electrons at the geomagnetic equator near 9 earth radii

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15.1295k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, Oct. 1988, p. 1295-1298.

Physics

32

Electron Distribution, Magnetic Equator, Magnetospheric Electron Density, Satellite Observation, Electron Flux Density, Field Aligned Currents

Scientific paper

AMPTE/CEE observations are used to study short-lived, highly anisotropic electron distributions in the region of the equatorial magnetosphere bewtween 6.6 earth radii and the CCE apogee at 8.8 earth radii. Intense bursts of highly collimated counterstreaming electrons were observed at keV energies with durations of a few tens of seconds to a few minutes near the geomagnetic equator on L-shells that intersect the high-latitude ionosphere in the region normally associated with the auroral zone. It is found that the counterstreaming electrons at energies below the peak energy are accompanied by simultaneous deep depressions of the locally mirroring fluxes. It is suggested that these equatorial electrons may result from the release of auroral electrons trapped beneath the auroral accelerating potentials at lower altitudes along the same magnetic flux tubes.

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