1. e layer a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length [syn: heaviside layer , kennelly-heaviside layer, e layer, e region]. 2. A region of the ionosphere, extending from about 90 to 150 kilometers (55 to 95 miles) above the earth and influencing long-distance communications by strongly reflecting radio waves in the range from one to three megahertz. Also called E region, Heaviside layer, Kennelly-Heaviside layer.
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