Red Auroral Arc (May 10)
Taken by Alan Dyer on May 10, 2015 @
near Gleichen, Alberta
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Camera Used: Canon Canon EOS 6D
Exposure Time: 32/1
Aperture: f/3.5
ISO: 3200
Date Taken: 2015:05:11 10:47:25
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Details:
Indicators looked good early in the evening on May 10 for a nice auroral display and sure enough we got one, but it was an unusual display. From my site in southern Alberta, the northern sky did have a diffuse glow of "normal" green aurora that never did take much form or structure. But overhead the aurora took the form of an arc across the sky, starting as an isolated ray in the southeast initially, then reaching up to arch across the sky with what looked to the eye like a colourless band. But the camera showed it as a red arc, with just a fringe of green curtains appearing for a few minutes. Then the entire structure faded away entirely leaving just a diffuse northern glow. The first image is from a stack of 80 exposures, each 32 seconds long showing the circumpolar star motion around Polaris and aurora movement blended over 45 minutes time. The other images are individual frames taken during the evening, showing snapshots of the red arc development, as it became more narrow in structure and gained some green curtain-like fringes. Presumably the red structure was very high in the atmosphere while the green curtains attached to it that did appear hung down from the high-altitude red arc. All images are with an 8mm fish-eye lens to capture most of the sky.
Photographer's website:
http://www.amazingsky.net
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