Physics
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..395s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 14, April 1987, p. 395-398. Research supported by the Swedish Board for Spac
Physics
20
Auroras, Evening, Satellite Observation, Ultraviolet Photography, Intensity, Satellite Imagery, Scientific Satellites, Swedish Space Program
Scientific paper
The Ultra Violet Imager on the Swedish Viking spacecraft frequently detects localized intensifications in the evening sector that expand poleward at about 0.4 km/s and eastward at up to 7.8 km/s, stopping abruptly at midnight. The events occur in a previously quiet auroral oval and seem to be associated with the formation of discrete aurora. If westward traveling surges are associated with these intensifications, they must be too small in size to be detected by the imager. The events are rather frequent in time, and comparatively small in extent and duration on a global scale; however they would appear as substantial breakups when viewed overhead at a ground-based station. Further study is needed to determine just how these events fit into the framework of currently existing substorm knowledge, and how they differ from the larger scale events observed by the imager.
Anger Clifford D.
Jones Vallance A.
Murphree John S.
Shepherd Gordon G.
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