Scientific results from the Viking Ultraviolet Imager - An introduction

Details Scientific results from the Viking Ultraviolet Imager - An introduction Scientific results from the Viking Ultraviolet Imager - An introduction

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..383a&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 14, April 1987, p. 383-386. Research supported by the Swedish Board for Spac

Physics

38

Auroras, Satellite Imagery, Scientific Satellites, Swedish Space Program, Ultraviolet Photometry

Scientific paper

The Ultraviolet Imager on the Viking spacecraft provides global images of aurora in both night and day hemispheres at rates of up to three per minute. First results reveal new aspects of the patterns and dynamics of the aurora, including: (1) eastward as well as westward expanding substorm intensifications, but very little evidence of bulk westward motion of auroral surges; (2) rapid poleward and equatorward expansions during some substorms, resulting in the formation of an intense eye-shaped bulge containing diffuse aurora and north-south aligned arc segments; (3) substormlike intensifications at the point where transpolar arcs join the nightside oval; (4) rapid small-scale auroral brightenings, or 'hot spots' over a wide range of local times; and (5) very rapid changes in auroral forms in the noon sector.

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