Taken by Matt Melnyk on April 10, 2018 @ Alberta Canada
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  Camera Used: Canon Canon EOS 5D Mark III
Exposure Time: 15/1
Aperture: f/2.8
ISO: 3200
Date Taken: 2018:04:10 03:18:13
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I read that a KP index of 4 was expected and this can be easily seen in southern Alberta Canada! I went to have a look and sure enough it was a great display of Arcs, pillars and proton arcs. Was a wonderful night for shooting aurora! Photos were taken just north of Calgary Alberta
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Hey Matt, that image of what you call a proton arc, is a sub auroral arc called STEVE,
Posted by HDT 2018-04-10 15:51:47
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