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A night of extraordinary aurora above the Arctic Circle, northern Alaska. An auroral curtain appears to drop from the Big Dipper. The temperature was around 5 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 - 150 km altitude, and red oxygen emission at around 150 to 300 km altitude. Visually, the greens and reds were pastel green and red.
The Big Dipper (Ursa Major) is at the top, center. The constellation Leo is at lower right. Bootes and the bright orange star Arcturus is at lower left.
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 4-second exposure at ISO 1600, f/1.4. 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 low-light digital_astro canon_r5 NEW
Image ID: aurora-c03.23-24.2022-alaska-rnclark-4C3A5443.b-1800s.jpg
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Last updated July 01, 2023