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E region

American  

noun

  1. the region of the ionosphere in which the E layer forms.

E region British  

noun

  1. Also called: Heaviside layer.   Kennelly-Heaviside layer.  a region of the ionosphere, extending from a height of 90 to about 150 kilometres. It reflects radio waves of medium wavelength See also ionosphere

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
E region Scientific  

  1. The region of the ionosphere that lies approximately 90 to 150 km (56 to 93 mi) above the Earth's surface. This region may affect long-distance communications because it influences radio waves in the 1-3 megahertz range.

  2. Also called E layer Heaviside layer

  3. Compare D region F region

Etymology

Origin of E region

First recorded in 1935–40

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.