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A night of extraordinary aurora above the Arctic Circle, northern Alaska. The temperature was around -10 degrees F and even though there were no coronal mass ejections from the Sun, and only low level geomagnetic activity predicted, the night was filled with all-sky colorful aurora. Just above the mountains the last remnants of twilight is visible. The aurora colors are yellow-green from oxygen emission at 557.5 nanometers at around 100 km altitude, red oxygen emission at around 150 to 300 km altitude, and blue/purple nitrogen emission above that. Visually, the greens and reds were pastel green and red. I do not recall seeing the blue/purple as different from twilight.
The Andromeda galaxy, M31, is near the left edge, middle of the frame. The Milky Way extends for the lower right just above the mountains to the upper left. The track above right of center is a satellite. The foreground is the frozen Middle Fork of the Koyukuk River in the Brooks Range.
The image was obtained with a
Canon EOS R5 Mirrorless Digital Camera and a Sigma 24mm f/1.4 DG HSM Art Lens
with a single 10-second exposure at ISO 800, f/1.4. The image was corrected for perspective distortion of the wide-angle lens. White balance is daylight. This is the full image, no crop.
For more information on aurora photography, see Aurora Photography.
To learn how to obtain stunning images like this, please visit my Extensive Articles on Photography .
Keywords to this image = astrophoto-1 aurora alaska nightscapes low-light digital_astro canon_r5 galaxy NEW
Image ID: aurora-c03.21-22.2022-alaska-rnclark-4C3A5028.c-1800s.jpg
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Last updated October 02, 2022