Why do AM radio stations broadcast farther at night?
The short answer is because of the nature of the ionosphere of the Earth. The ionosphere consists of several different layers of gases that have become conductive from the bombardment of the atoms by: solar radiation, by electrons and protons emitted by the sun, and by cosmic rays.
These layers, sometimes called the Kennelly-Heaviside layer, reflect AM radio signals, thus enabling AM broadcasts to be received by radios that are a long way from the transmitting station. At night, the ionosphere layers partially dissipate and become an excellent reflector of the short waveband AM radio waves.
Source: The Handy Science Answer Book.
Thanks for the info about the Am travels at night. I can get a station from 4 city’s about 100 to 200 miles away at night. I couldn’t place my figer on what this was called until now. Thanks.
Thanks for the talk on the radio at night. I can get 4 stations maybe 5 from 100 miles to 5,000 miles at night thanks for posting
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