Greenland Ice Cap
A weak 22° halo shines over the windswept wastes of the Greenland Ice Cap.   Imaged by Ed Stockard (photostream) 4th October -25C at Summit Station 72°35'N 38°25'W 15,530 ft above mean sea level. The ice beneath the station is nearly two miles thick.
©Ed Stockard, shown with permission.
Atmospheric
Optics

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1st October, a brighter and less windy day. Diamond dust and a low sun spin a parhelic circle around the sky.   The elongated brightening on the right is a 120° parhelion.




























Above the sun a weak upper tangent arc. Above that a circumzenithal arc from hexagonal plate crystals.

Plate crystals have created the two sundogs and contributed to the parhelic circle.