Толковый словарь английского языка - ionosphere
Ionosphere
ionosphere
noun Date: 1926 the part of the earth's atmosphere in which ionization of atmospheric gases affects the propagation of radio waves, which extends from about 30 miles (50 kilometers) to the exosphere, and which is contiguous with the upper portion of the mesosphere and the thermosphere, ionospheric adjective ionospherically adverb
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1.
n. an ionized region of the atmosphere above the stratosphere, extending to about 1,000 km above the earth's surface and able to reflect radio waves for long-distance transmission round the earth (cf. TROPOSPHERE). Derivatives ionospheric adj. ...Толковый словарь английского языка Oxford English Reference
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