Abstract
High-resolution scanner images of auroras obtained by a Dapp satellite flown by the United States Air Force provide new insights into auroral morphology. Images obtained during an active period, January 25 and 26, 1973, confirm the general validity of the concept of the auroral substorm. In addition, the images clearly show such morphological features as the shift of initial brightening toward the dusk sector during disturbed periods, predominance of discrete auroras in the evening sector, the latitudinal separation of discrete and diffuse auroras, and the merging of some polar cap auroras with auroras in the oval.
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