Cloudtop Green Flash
Spaceweather.com reader Mila Zinkova of San Francisco was photographing the sunset on Jan. 29th when a puff of sun detached itself and turned green. It was a rare cloud-top green flash:
Atmospheric optics expert Les Cowley explains what happened: "San Francisco and the Californian coast is a world top spot for green flashes. Air is cooled by the cold offshore current and topped by warmer air from inland to provide the ideal temperature profile for sunset mirages and flashes."
"Mila's flash might be something extra special - a 'cloud-top' flash. These are seen as the sun's rays graze a distant cloud bank. Marine stratus can be trapped by temperature inversion layers which could generate some of the flashes. But that is not always the case; there is much unexplained about them."
From SpaceWeather.com
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