Abstract
Satellite photographs of auroras obtained from a polar-orbiting U.S. Air Force satellite were used to study auroral substorms in the premidnight time sector during and after a geomagnetic storm period. The photographs provide a unique means of seeing in detail the interrelationship between discrete, continuous/diffuse, and polar cap auroras during a period of frequent occurrence of substorms. The distributions of discrete auroras seen in the satellite photographs further substantiate the Feldstein auroral oval concept and the Akasofu auroral substorm concept. However, the photographs suggest that the continuous aurora and polar cap auroras have not been adequately accounted for in the present concepts of auroral substorm morphology.
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