Red Auroral Arc
Taken by Alan Dyer on April 14, 2021 @
near Gleichen, Alberta
Click photo for larger image
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Camera Used: NIKON CORPORATION NIKON D750
Exposure Time: 30/1
Aperture: f/2.5
ISO: 800
Date Taken: 2021:04:15 12:05:22
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Details:
Here are panoramas of the arc of aurora from April 14-15, taken from home in southern Alberta, with the first panorama taken at about 12:15 am MDT and the second about 15 minutes later. Both are stitched from multiple images taken with a 24mm lens.
The earlier panorama shows a very red component, above (higher in altitude than and/or farther south of) the main green auroral arc. To the camera the northern sky was very red, though this was not visible to the unaided eye.
Might this be a SAR Arc? A Stable Auroral Red Arc, a phenomena related to STEVE. But in this case the red arc was sub-visual - only the camera picked it up, though to the eye there was a very diffuse brightness above the main aurora.
This outbreak of a very red arc lasted only a few minutes more. By 12:30 am the main red arc had dissipated but a red STEVE-like arc remained, but it too soon faded.
Photographer's website:
https://www.amazingsky.net
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