heterosphere

heterosphere
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

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  • 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

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  • 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 …  

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