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Airglow is the very weak emission of light by the upper atmosphere. It is caused by various processes such as the recombination of ions which were photoionized by the sun during the day, luminescence caused by cosmic rays striking the upper atmosphere, and chemiluminescence.

airglow 
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Subclass of atmospheric optical phenomenon
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Media in category "Airglow"

The following 143 files are in this category, out of 143 total.