Physics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9510575l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, July 1, 1990, p. 10575-10589. Research supported by NSERC.
Physics
19
Auroral Electrojets, Magnetic Signatures, Magnetic Storms, Storm Surges, International Sun Earth Explorers, Interplanetary Magnetic Fields, Radar Measurement, Satellite Imagery, Viking Spacecraft
Scientific paper
Simultaneous magnetogram, radar, and Viking imager data from evening local time are used to study several substorm expansion phase onsets and an expansion phase auroral surge that formed near the radar field of view. At the onsets, auroral brightenings developed within the region of the electric field gradient of the Harang discontinuity, and if not already present, a westward electrojet began poleward of the eastward electrojet. Immediately following onsets, the poleward boundary of the westward electrojet moved poleward along with the poleward boundary of the aurora. The auroral surge formed along the poleward boundary of the westward electrojet (and of the aurora). It is suggested that the distortion of the poleward boundary of the aurora associated with the surge was a manifestation of a distortion of the separatrix between open and closed magnetic field lines, the distortion being caused by the field-aligned currents within the head of the surge.
de La Beaujardiere Odile
Friis-Christensen Eigil
Lyons Larry R.
Murphree John S.
Rostoker Gordon
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