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geocorona
ge·o·co·ro·na G0091400 (jē′ō-kə-rō′nə)n. The ultraviolet light emanating from the outermost region of the earth's atmosphere, consisting chiefly of sunlight absorbed and then reemitted from hydrogen atoms.geocorona (ˌdʒiːəʊkəˈrəʊnə) n (Physical Geography) the outer layer of the earth's atmosphereTranslationsgeocorona
geocorona (jee-oh-kŏ-roh -nă) A tenuous cloud of hydrogen and some helium extending more than 50 000 km from the Earth's outermost atmospheric layer to the magnetosphere. It scatters Lyman-alpha radiation (see Lyman series) from the Sun, producing a glow that is visible on long-distance far-ultraviolet photographs of the Earth. It also interferes with far-ultraviolet astronomical observations from Earth orbit.geocorona[¦jē·ō·kə′rō·nə] (geophysics) The outermost part of the earth's atmosphere, consisting of extremely attenuated hydrogen extending to perhaps 15 earth radii, that emits Lyman-alpha radiation under the action of sunlight. |