Field notes about a strange aurora (IMAGE)

University of Iowa

Field notes about a strange aurora

Caption

Notes written by David Knudsen, a physicist at the University of Calgary, in 2002 make mention of a "pulsating 'black out' diffuse glow, which then fills in over several seconds." Two decades later, University of Iowa physicists describe the phenomenon, in which patches of the background glow are blotted out, then suddenly intensify and reappear.

Credit

David Knudsen, University of Calgary

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