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| ISO 800, 1/10 sec, 80 mm, handheld |
Saturday, January 26, 2013
Red ring around the Wolf Moon
This red and blue ring around the full "Wolf Moon" tonight is a corona, not a halo. "Coronae differ from haloes in that the latter are formed by refraction (rather than diffraction) from comparatively large rather than small ice crystals. Reddish colors always occupy the outer part of a corona's ring" (source).
The lunar corona is formed the same way a rainbow is formed in daylight (diffraction), but that doesn't make it a moonbow.
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