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An impressive aurora over Pyramid Lake, Nevada on October 17, 2012. There are two sources : a general green glow above the northern horizon, and a red sky glow with banding. There are no clouds in this scene. Just above the horizon is the big dipper, and little dipper is 1/3 of the distance from the top, and to the right. The dipper part of the little dipper is just above center. The aurora was visible to my eyes, but I could not see the color. This northerly view looks over Pyramid Lake and the Black Rock desert beyond. For more on natural color in the night sky see Parts 2a, 2b, 2c and 2d on Color of the Night Sky and proper post processing to show those colors.
Technical. Canon 1D Mark IV digital camera with 24mm f/1.4 lens at f/2, 30 second exposures at ISO 1600. This is a 3-frame mosaic. Original image is 4843 x 6912 pixels (33.5 megapixels), covering about 65 by 90 degrees. Plate scale of original = 0.816 arc-minutes/pixel. No tracking of the stars as a 30 second image at these northern declinations resulted in minimal trailing. The challenge in acquiring this image was getting 30 seconds with no airplane tracks. The aurora was surprising because the Wing Kp index was only about 2.7.
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Keywords to this image = astrophoto-1 nightscapes mountains lakes mosaic nevada night low-light reflections digital_astro canon_1d4
Image ID: nightscape.pyramid.lake.c10.17.2012.C45I1338-43.h-bin5x5-900v.jpg
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Last updated July 31, 2020