Other
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.4307r&link_type=abstract
Journal of Geophysical Research, vol. 83, Sept. 1, 1978, p. 4307-4317. Research sponsored by the Bundesministerium für Forschun
Other
1
Azur Satellite, High Energy Electrons, Low Altitude, Satellite Observation, Trapped Particles, Auroral Zones, Earth Magnetosphere, Electric Fields, Electrojets, Electron Flux Density, Morning, Night, Polar Orbits
Scientific paper
Data obtained by the German polar-orbiting satellite Azur during dawn-dusk traversals of the auroral zone are used to reexamine the previously reported dawn-dusk asymmetry of the boundary position of the 40-keV electrons. The asymmetry (boundary positions in the dawn sector are at higher latitudes than are the boundary positions for the dusk sector) disappears during prolonged periods of low electrojet activity and in other described circumstances. The average boundary contour has an almost circular shape centered at 2 deg away from the magnetic pole on the midnight meridian. The average boundary contour of undisturbed 30- and 40-keV electron flux profiles is thought to represent the high-latitude limit of stable trapping in the undisturbed magnetosphere.
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