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twilight glow

noun
1.
See under airglow.
Origin
1810-1820
1810-20

airglow

[air-gloh] /ˈɛərˌgloʊ/
noun
1.
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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for twilight glow

airglow

/ˈɛəˌɡləʊ/
noun
1.
the faint light from the upper atmosphere in the night sky, esp in low latitudes
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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twilight glow in Science
airglow
  (âr'glō')   
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 Article for twilight glow

weak, widespread, and relatively steady glow from the sky that is observed around twilight; it is part of the overall phenomenon called airglow (q.v.).

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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

Learn more about airglow with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Word Value for twilight

15
16
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