ice halos and other optics

Odd radius display in Resolute Bay

This one occured on 3 April 1998. The spots near the horizon are lower 24° plate arcs. Sometimes is not easy – or even possible – to distinquish them from reflected Lowitz arcs. But this case is obvious, there is also a good lower 9° plate arc. Much fainter are 18°, 23° and upper 24° plate arcs.  The display lasted for several hours, temperature was around -27° C. The source for this display is not known. Maybe it was natural.


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  1. Pingback: Summit Station Photos Spark Interest in Atmospheric Optics

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