E-region definitions

The atmospheric zone within the ionosphere at an altitude of c. 90 to 140 km (c. 56 to 90 mi), containing the E layer.
noun
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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.
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