airglow

[air-gloh]
noun
a dim light from the upper atmosphere caused by emissions from atoms and molecules ionized by solar radiation: observed at night (nightglow) during the day (dayglow) and at twilight (twilight glow) with each having slightly different characteristics.

Origin:
1950–55; air1 + glow

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
airglow (ˈɛəˌɡləʊ)
 
n
the faint light from the upper atmosphere in the night sky, esp in low latitudes

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
airglow   (âr'glō')  Pronunciation Key 
A faint photochemical luminescence in the upper atmosphere caused by the collision of x-rays and charged particles from the Sun with atoms and molecules, especially of oxygen, sodium, and the hydroxyl radical (OH). Airglow is strongest over low and middle latitudes.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

airglow

faint luminescence of the Earth's upper atmosphere that is caused by air molecules' and atoms' selective absorption of solar ultraviolet and X-radiation. Most of the airglow emanates from the region about 70 to 300 km (42 to 180 miles) above the surface of the Earth. Unlike the aurora, airglow does not exhibit structures such as arcs and is emitted from the entire sky at all latitudes at all times. The nocturnal phenomena is called nightglow. Dayglow and twilight glow are analogous terms

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
After asking several astronomers, they are possible noctilucent clouds, airglow or faint aurora.
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