Proton Arc During Aurora
Taken by Chris Ratzlaff on August 28, 2014 @ NW of Calgary, Alberta, Canada
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  Camera Used: Canon Canon EOS 6D
Exposure Time: 15/1
Aperture: f/2.8
ISO: 800
Date Taken: 2014:08:28 01:21:40
 
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Details:
Proton arc was observed about an hour after a very vibrant auroral display, was clearly visible to the naked eye and extended from the easter horizon to overhead (Calgary, Alberta).
Canon 6D, 15s, f/2.8, ISO 800
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