Aurora
Taken by Ben Hattenbach on March 17, 2015 @
Alaska
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Camera Used: NIKON CORPORATION NIKON D800E
Exposure Time: 5/1
Aperture: f/1.4
ISO: 1600
Date Taken: 2015:03:28 21:45:14
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Details:
I've seen patches and bands of purple before. But over many years of aurora photography, I've only seen this once: a broad purple aurora. The purple wavelength is emitted by lighter gasses high up in the ionosphere, such as helium and hydrogen. The image was captured during a period of intense geomagnetic activity -- during a time when the Kp index hovered between about 5 and 8 for most of a week, resulting in what seem to have been the strongest and most sustained auroras of the last decade. This image is a panorama, made by stitching together six vertical frames captured in very quick succession with a 35mm f 1.4 lens (the extremely sharp, low coma, reasonably priced Sigma Art).
Photographer's website:
http://www.benhattenbach.com
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