High altitude sun pillar 

High altitude pillar

Halos are found in surprising places. Halo enthusiast Martha Dawson of Squaw Valley, California saw this one midway between England and Greenland in November '01.

Horizontally aligned plate crystals in very high thin cirrus haze were sufficient to form the pillar above the sun which lingered on the horizon as the 'plane chased it westwards.

©Martha Dawson, reproduced with permission.

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