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ionosphere 音標拼音: [ɑɪj'ɑnəsfir] [ɑɪ'ɑnəsfir] n. 電離層 電離層 ionosphere n 1: the outer region of the Earth' s atmosphere; contains a high concentration of free electronsionosphere \ ionosphere\ n. the outer region of the earth' s atmosphere, beyond which is the { exosphere}; it contains a high concentration of free electrons and ions, and extends from about 50 miles to about 250 miles above the earth' s surface, but the height shows daily and seasonal variation, and the composition of the particles in the ionosphere is also affected by events such as solar flares. [ WordNet 1. 5 PJC] 45 Moby Thesaurus words for " ionosphere": Appleton layer, CAT, F layer, Heaviside- Kennelly layer, Van Allen belt, aerospace, aerosphere, air hole, air pocket, airspace, belt, bump, ceiling, chemosphere, crosswind, empty space, favorable wind, fog, front, head wind, high- pressure area, hole, isothermal region, jetstream, layer, low- pressure area, lower atmosphere, outer atmosphere, overcast, photosphere, pocket, roughness, soup, space, stratosphere, stratum, substratosphere, tail wind, tropopause, troposphere, trough, turbulence, upper atmosphere, visibility, visibility zero
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