the lowest atmospheric zone within the ionosphere, at an altitude of c. 55 to 90 km (c. 34 to 56 mi), containing the D layer
D region
D regionWebster's New World College Dictionary, Fifth Edition Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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"D region." YourDictionary, n.d. Web. 17 January 2019. <https://www.yourdictionary.com/d-region>.
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D region. (n.d.). Retrieved January 17th, 2019, from https://www.yourdictionary.com/d-region
D region
noun
See D layer.
THE AMERICAN HERITAGE® DICTIONARY OF THE ENGLISH LANGUAGE, FIFTH EDITION by the Editors of the American Heritage Dictionaries. Copyright © 2016, 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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MLA Style
"D region." YourDictionary, n.d. Web. 17 January 2019. <https://www.yourdictionary.com/d-region>.
APA Style
D region. (n.d.). Retrieved January 17th, 2019, from https://www.yourdictionary.com/d-region
The region of the atmosphere that lies in the upper mesosphere, extending from about 70 to 90 km (43 to 56 mi) above the Earth. The D region is responsible for the daytime absorption of high-frequency radio signals; at night, oxygen ions recombine with free electrons and form oxygen molecules that are transparent to such signals, which bounce off of the E region and back to Earth. Also called D layer
Compare E region
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Cite this page
MLA Style
"D region." YourDictionary, n.d. Web. 17 January 2019. <https://www.yourdictionary.com/d-region>.
APA Style
D region. (n.d.). Retrieved January 17th, 2019, from https://www.yourdictionary.com/d-region
