Jisho

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現象
Wikipedia definition
1. SkywaveSkywave is the propagation of radio waves bent (reflected) back to the Earth's surface by the ionosphere. As a result of skywave propagation, a broadcast signal from a distant AM broadcasting station at night, or from a shortwave radio station can sometimes be heard as clearly as local stations. This is distinct from groundwave propagation, where the radio wave travels horizontally directly from transmitter to radio, which is the dominant propagation mode at lower frequencies.
Read “Skywave” on English Wikipedia
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