Friday, July 19, 2013
Mt. Rainier Like You've Never Seen it Before by Darren Neupert July 2013
have been making relatively
frequent appearances over the Northwest
this summer, but the green tinge captured in photographs above Mt. Rainier on the night of July 12th wasn't the aurora.
It was instead what's known as "airglow."
airglow covers the entire planet and is there all the time
, caused by reactions between solar energy and certain air molecules. It's just not visible in daytime due to sunlight and is hard to spot at night from other light pollution.
according to the Atmospheric Optics website
, airglow fluctuates a bit with the 11-year solar cycle as increased solar activity can enhance it a bit. And solar activity was high last weekend when these photographers were taken.
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