Auroras

Challenge #2 in the Mother Nature series. Hosted by mirceadumitriu, happy_hope.
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Pictures of Auroras (Borealis or Australis), as described here: http://en.wikipedia.org/wiki/Aurora_(astronomy)
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purple rain
by MG 64
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another fascinating aurora from a three week trip along the Alatna river, Gates of the Arctic NP, AK. I liked the purple color from the nitrogen atoms. We could observe them during one night only and I was glad to capture that magic moment.
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Submitted: Thursday, 31st March, 2011 17:06 (GMT)
Taken: Sunday, 30th August, 2009
Focal length: 17 mm
Shutter speed: 16 sec
Aperture: F6.3
ISO: 3200
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