Airglow

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Airglow
The airglow is the very weak emission of light by the Earth's atmosphere; as a result, the night sky is never completely dark. It was first noticed in 1868 by Anders Ångström. It is caused by various processes in the upper atmosphere, such as the recombination of ions which were photoionised by the sun during the day, luminescence caused by cosmic rays striking the upper atmosphere, and chemiluminescence caused mainly by oxygen and nitrogen reacting with hydroxyl ions at heights of a few hundred kilometres. It is not noticeable during the daytime because of the scattered light from the Sun.
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AIRGLOW
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airglow
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airglow
Eng: airglow
Urdu: وہ مدھم روشنی جو بالائی کُرہ ہوا میں طبیعی اور کیمیائی عملوں کے باعِث ہوا سے پیدا ہوتی ہے ۔
  

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