GREEN FLASHES:
There was a time, long ago, when people thought the green flash was a myth, a phenomenon of fiction--and if you saw one you couldn't believe your eyes. But what if you saw six?
There are at least half a dozen green flashes in this 11 MB movie of an Atlantic sunset recorded by astrophotographer Dirk Ewers:
I just came back from vacation on the Canary Island of La Palma," says Ewers. "While I was there, I witnessed a very clear sunset with multiple green flashes. They were real."
Indeed, they are. Green flashes are caused by a mirage, which magnifies tiny differences in the atmospheric refraction of red and green light. In this case, temperature gradients above the water produced a complex mirage and, not one, but many flashes.
Watch the movie again. "In the first seconds of the video, you can see sunspot 1193 flowing into the sea at the bottom right of the sun's edge," points out Ewers.
Posted: 8:55:41 AM
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