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airglow |
Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson | 0.07 sec. |
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airglow, faint diffuse illumination of the night sky originating in the upper atmosphere. The energy in the form of visible light is derived from the sun's ultraviolet light, which ionizes atoms and dissociates molecules at heights between 40 and 200 mi (64–322 km) above the earth's surface. When the fragments collide and recombine, some atoms and molecules are left with excess energy, which they release as light at characteristic wavelengths. Most prominent in the visible spectrum are the red and green light of oxygen and the yellow light of sodium. In southern and northern polar regions the airglow is often masked by the aurora (see aurora borealis aurora borealis (bôr'ēăl`ĭs) and aurora australis ..... Click the link for more information. ). Airglow hampers optical telescopic observations on earth by reducing the apparent contrast between stars and space. airglow [′er‚glō] (geophysics) The quasi-steady radiant emission from the upper atmosphere over middle and low latitudes, as distinguished from the sporadic emission of auroras which occur over high latitudes. Also known as light-of-the-night-sky; night-sky light; night-sky luminescence; permanent aurora. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| ? Mentioned in | ? References in periodicals archive | ||
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In 2001, SRI led a team that made the first observation of visible light
emitted by oxygen atoms in the night airglow of Venus, offering new
insight into the planet's atmosphere. Teradyne's Catalyst will
test Airoha's new Airglow SiGe BiCMOS device used in cellular
products and the company's new Airlink device used in WLAN
products. SRI International, a leading research institute based in Silicon
Valley, reported the first observation of visible light emitted by
oxygen atoms in the night-side airglow ("nightglow") of Venus. |
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