Definition of D-layer in English :

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D-layer

see synonyms of d-layer

Noun

1. d region, d-layer

the lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves

WordNet Lexical Database for English. Princeton University. 2010.


D-layer

see synonyms of d-layer
the lowest area of the ionosphere, having increased ion density and existing only in the daytime: it begins at an altitude of about 70 km (c. 43 mi) and merges with the E layer

Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by Houghton Mifflin Harcourt. All rights reserved.