D region


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D region

n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

D region

or

D layer

n
(General Physics) the lowest region of the ionosphere, extending from a height of about 60 kilometres to about 90 kilometres: contains a low concentration of free electrons and reflects low-frequency radio waves. See also ionosphere
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

D layer


n.
the lowest region of the ionosphere, at an altitude of ab. 50 mi. (80 km).
[1930–35]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.D region - the lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves
ionosphere - the outer region of the Earth's atmosphere; contains a high concentration of free electrons
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