This still image the Aurora Borealis is a processed frame from a timelapse video taken near Whitehorse in the Yukon Territory of Canada on the night of 29-30 January 2020.
The still image covers about 84 degrees of the northern sky, so the aurora is quite extensive at that stage.
A link to the time lapse video is:
https://drive.google.com/open?id=1ecpmsQYo63qTk-zp8jbBLTmR_QGfHVQYThree hours of aurora activity have been compressed into a one-minute timelapse video. 1049 x 6 second frames were taken using a Sigma 20mm f1.4 lens (at f/2.0) on a Nikon D750 camera attached to a fixed tripod.
Not much was expected due to the predicted low-to-moderate aurora activity, weather etc; but luckily, the aurora suddenly expanded to fill the sky around midnight (about half way into the video).
The aurora was moving very quickly, with strong waves flowing from east to west. If you look closely after the aurora expands to fill the sky, you can see a faint green glow on the snow from the reflected light when the aurora expands across the sky.
The still image incorporates a single 6-second frame of the aurora together with a stack of 32 subframes for the foreground.
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