单词 | geocorona |
释义 | geocoronage·o·co·ro·naG0091400 (jē′ō-kə-rō′nə)geocorona(ˌdʒiːəʊkəˈrəʊnə)geocoronageocorona(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] |
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