Physics
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..407r&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 14, April 1987, p. 407-410. Research supported by the Swedish Board for Spac
Physics
42
Auroras, Night Sky, Polar Substorms, Satellite Imagery, Ultraviolet Photography, Auroral Arcs, Electron Precipitation
Scientific paper
Longitudinally confined north-south oriented arc structures are often associated with a discrete region of luminosity developing equatorward of active auroras during substorms. The behavior of such auroral arc structures, which may turn on and off sporadically during the substorm lifetime, is studied using data from the Viking UV imager, which yielded images with a time resolution of 1 min. The observations suggest that these north-south aligned structures near the equatorward edge of the oval may represent precipitation of a spatially localized population of energetic electrons for which the westward convective drift velocity in the evening sector nearly balances the eastward gradient and curvature drift velocity, thus leading to purely earthward convective drift of the energetic electrons.
Anger Clifford D.
Lui Anthony Tat Yin
Murphree John S.
Rostoker Gordon
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