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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. 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. Yellow shows were red and green show along the field of view. The bright yellow band in the center of the image is looking up the curtain. Visually, the greens, reds and yellows were pastel green, red and yellow.
The foreground is the frozen Middle Fork of the Koyukuk River in the Brooks Range. The mountain is unnamed and about 4860 feet high.
The constellation Leo is at upper right, and Bootes at upper left. The bright star near the left edge, center is Arcturus.
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. White balance is daylight. This is the full image, no crop. The image was obtained at about 1182 feet in elevation.
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 NEW
Image ID: aurora-c03.21-22.2022-alaska-rnclark-4C3A5050.b-1800s.jpg
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Last updated April 14, 2023