Heaviside Layer

Noun1.Heaviside layer - a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length
ionosphere - the outer region of the Earth's atmosphere; contains a high concentration of free electrons
region, part - the extended spatial location of something; "the farming regions of France"; "religions in all parts of the world"; "regions of outer space"

 

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