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E region
E re·gion


noun 
Definition:
 
middle part of the ionosphere: the middle part of the ionosphere, lying approximately 80 to 110 km (50 to 70 mi) above the Earth's surface, that reflects medium-length radio waves
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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