SAR Arc & Aurora
Taken by Alan Dyer on May 11, 2021 @
near Gleichen, Alberta
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Camera Used: Canon Canon EOS Ra
Exposure Time: 120/1
Aperture: f/1.8
ISO: 1600
Date Taken: 2021:05:12 11:56:22
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Details:
We had a decent display of Northern Lights from southern Alberta May 11/12, 2021 with a traditional green auroral arc across the north.
But south of the main arc was a very faint and diffuse red band, likely a showing of a SAR arc -- a Stable Auroral Red arc. It was not visible to the naked eye but the camera, a red-sensitive Canon EOS Ra, picked it up in 30-second and 2-minute exposures, as well as the Milky Way spanning the sky. The SAR arc brightened after the main auroral arc faded in activity as a brief substorm subsided.
SAR arcs have been documented for some time but are almost always sub-visual, as it was this night.
The lens was an 11mm full-frame fish-eye for a 180° field of view.
Photographer's website:
https://www.amazingsky.com
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