Geocorona

Geocorona

La geocorona (qui signifie couronne terrestre) est la partie lumineuse de la région la plus externe de l'atmosphère terrestre, l'exosphère.

Elle est visible principalement par le rayonnement dans l'ultraviolet lointain (Lyman-alpha) du Soleil qui est diffusée par l'hydrogène neutre. Elle s'étend jusqu'à au minimum 15,5 diamètres terrestres.

La geocorona a été étudiée depuis l'espace par les satellites Astrid et Galileo (sonde spatiale) (entre autres), à l'aide de leur spectromètre ultraviolet lors du survol de la Terre.

Voir aussi

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  • geocorona — [jē΄ōkə rō′nə] n. the envelope of ionized gases, esp. hydrogen, surrounding the earth at the outer limit of the atmosphere …   English World dictionary

  • Geocorona — The geocorona is the luminous part of the outermost region of the Earth s atmosphere, the exosphere. It is seen primarily via far ultraviolet light (Lyman alpha) from the Sun that is scattered from neutral hydrogen. It extends to at least 15.5… …   Wikipedia

  • geocorona — geocoronal, adj. /jee oh keuh roh neuh/, n. a belt of ionized hydrogen surrounding the earth at the outer limit of the exosphere. [1955 60; GEO + CORONA] * * * …   Universalium

  • geocorona — noun The region of ionized hydrogen that makes up the outermost region of the Earths atmosphere. (And by extension of other planets.) …   Wiktionary

  • geocorona — geo·corona …   English syllables

  • geocorona — ¦jēəˌ noun Etymology: ge + corona : the outermost part of the earth s atmosphere consisting primarily of hydrogen * * * geocoronal, adj. /jee oh keuh roh neuh/, n. a belt of ionized hydrogen surrounding the earth at the outer limit of the… …   Useful english dictionary

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  • Astrid (satellites) — Infobox Spacecraft Name = Astrid 1 Caption = Astrid 1. Organization = Swedish National Space Board Major Contractors = Swedish Space Corporation Mission Type = Orbiter Satellite Of = Earth Orbital Insertion Date = Launch = January 24, 1995 (03:54 …   Wikipedia

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