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Cluster probes the mysteries of the black aurora
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- Title Cluster probes the mysteries of the black aurora
- Released 06/03/2002 11:31 am
- Copyright Photograph courtesy of Jan Curtis, Fairbanks, Alaska
The dark band in the green aurora pictured here is an example of a black aurora. A black aurora isn't an aurora at all; rather it is a lack of auroral activity. The black aurora is only visible to the naked eye if it is embedded in a region of diffuse (faint) aurora.