orange on the distant aurora
Taken by nicolas lefaudeux on March 16, 2018 @
Finnish and Swedish Lapland
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Details:
I saw the question about orange auroras. i did capture some orange on auroras on occasions were the auroras were seen as a ribbon going close to the horizon in the distance. I interpreted this as an effect of atmospheric absorption. near the horizon, the blue and green wavelengths are more absorbed. this is why the sun appears orange or red at sunset. indeed, to get orange color, one does not need orange wavelength, orange can be obtained with the right balance of red and green (a property called metamerism). thus, in auroras, the mix of oxygen green, and nitrogen pink (which contains some red wavelength) could give orange when the atmospheric absorption is just right to dim the green enough so that it gives, together with the red wavelengths, the visual orange color. on my images, the auroras are regular green and pink auroras, but their color shift to orange near the horizon.
you can see some of my aurora images on my website: https://hdr-astrophotography.com/northern-lights/
Photographer's website:
https://hdr-astrophotography.com/northern-lights/
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