Physics
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..399r&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 14, April 1987, p. 399-402. Research supported by the Swedish Board for Spac
Physics
37
Auroral Zones, Polar Substorms, Satellite Imagery, Oxygen Atoms, Scientific Satellites, Ultraviolet Photography
Scientific paper
Data from the UV imager aboard the Viking satellite were used to analyze the explosive onset and the development of an auroral substorm. It was found that the eye (the envelope of the disturbed region) expands both poleward and azimuthally to the east and west, reaching an azimuthal extent of almost 6 h of magnetic local time after about 15 min. Within the eye, discrete regions of enhanced luminosity develop with a tendency for each newly disturbed region to be to the west of the previous ones. Each region of enhanced luminosity within the eye remains relatively stationary, fluctuating in intensity over its lifetime. The regions of enhanced luminosity were identified with westward traveling surges (defined from ground observations). The data demonstrate that these surges do not necessarily propagate, although the overall envelope of the disturbed region expands during the lifetime of the event.
Anger Clifford D.
Gattinger Richard L.
Jones Vallance A.
Murphree John S.
Rostoker Gordon
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