heterosphere

The upper portion of a two-part division of the atmosphere according to the general homogeneity of atmospheric composition; the layer above the homosphere. The hetero-sphere is characterized by variation in the composition and the mean molecular weight of constituent gases. This region starts at 50 to 60 miles (80–100 km) above the earth and, therefore, closely coincides with the ionosphere and the thermosphere.

Aviation dictionary. 2014.

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  • hétérosphère — ● hétérosphère nom féminin Zone de l atmosphère d une planète située au dessus de la turbopause, dans laquelle les constituants principaux se stratifient sous l influence du champ de gravitation. hétérosphère [eteʀosfɛʀ] n. f. ÉTYM. V. 1900; de… …   Encyclopédie Universelle

  • heterosphere — [het′ər ō sfir΄] n. the upper of two divisions of the earth s atmosphere, above c. 70 km (43 mi), characterized by variation in its component gases: cf. HOMOSPHERE * * * …   Universalium

  • heterosphere — [het′ər ō sfir΄] n. the upper of two divisions of the earth s atmosphere, above c. 70 km (43 mi), characterized by variation in its component gases: cf. HOMOSPHERE …   English World dictionary

  • heterosphere — heterosfera statusas T sritis ekologija ir aplinkotyra apibrėžtis Žemės atmosfera, esanti aukščiau kaip 100 km (virš homosferos), kur oro sudėtis labai pakitusi dėl molekulių disociacijos. atitikmenys: angl. heterosphere vok. Heterosphäre, f rus …   Ekologijos terminų aiškinamasis žodynas

  • heterosphere — noun The upper part of the atmosphere, above about sixty miles, in which there is great variation in its composition. See Also: homosphere …   Wiktionary

  • heterosphere — /ˈhɛtərəsfɪə/ (say hetuhruhsfear) noun the earth s atmosphere above the altitude of 80 km, characterised by a composition that varies with altitude, with higher mass constituents such as oxygen and nitrogen diminishing quickly and leaving lighter …   Australian English dictionary

  • AÉRONOMIE — L’aéronomie a pour objet l’étude des régions atmosphériques où les phénomènes de dissociation et d’ionisation sont importants. Cette définition s’applique aussi bien à l’atmosphère terrestre qu’aux atmosphères planétaires. Le mot aéronomie fut… …   Encyclopédie Universelle

  • Earth's atmosphere — ppmvThe composition figures above are by volume fraction (V%), which for ideal gases is equal to mole fraction (that is, the fraction of total molecules). Although the atmosphere is not an ideal gas, nonetheless the atmosphere behaves enough like …   Wikipedia

  • Atmosphere of Earth — Air redirects here. For other uses, see Air (disambiguation). Qualities of air redirects here. It is not to be confused with Air quality …   Wikipedia

  • atmosphere — atmosphereless, adj. /at meuhs fear /, n., v., atmosphered, atmosphering. n. 1. the gaseous envelope surrounding the earth; the air. 2. this medium at a given place. 3. Astron. the gaseous envelope surrounding a heavenly body. 4. Chem. any… …   Universalium

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