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Detailed Reference Information
Davis & Hallinan 1976
Davis, T.N. and Hallinan, T.J. (1976). Auroral spirals 1. Observations. Journal of Geophysical Research 81: doi: 10.1029/JA081i022p03953. issn: 0148-0227.

Auroral spirals of 20- to 1300-km diameter are a common part of the active auroral display. They appear most frequently in the evening and midnight sectors, where they appear to be produced as a consequence of magnetic field line distortion caused by field-aligned currents. More quiescent spiral forms exhibiting somewhat different characteristics occur during quiet times in the polar cap near the dawn portion of the auroral oval.

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Abstract

Journal
Journal of Geophysical Research
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American Geophysical Union
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