Abstract
A new theory of auroral morphology based on the production of instabilities in electron sheets is developed. It is found that the theory predicts a longer duration of homogeneous auroral arcs in the early evening and a shorter duration during morning hours. Observed transitions from glow to homogeneous arcs to ray arcs and draperies are also predicted. An especially interesting feature is the lowering of mirror points accompanying development of brighter features of a display. The theory also achieves encouraging success in explaining horizontal and vertical luminous wave-progressions found in flaming aurora.
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