GREEN SLICES OF SUNSHINEPhotographer Mila Zinkova of San Francisco was watching the sunset on June 24th when a few slices of the sun lifted off and turned green. "It was an amazing green flash," she says:
Atmospheric optics expert Les Cowley explains: "All green flashes are mirages.The setting sun's rays bend as they slant across air layers at different temperatures. When the bending is strong enough we see multiple images. But the images areslices rather than complete suns. Some are the right way up and sink with the setting sun while others are inverted and climb upwards. In Mila's complex sunset, several mirage slices show the same sunspot (AR2371), while the very topmost slice magnifies the ordinarily invisible green rim into a green flash."