D layer
| Dictionary: D layer |
n.
The lowest region of the ionosphere, existing only during the day and extending from about 40 to 65 kilometers (25 to 40 miles) above the earth. Also called D region.
| 5min Related Video: D layer |
| WordNet: D region |
Note: click on a word meaning below to see its connections and related words.
The noun has one meaning:
Meaning #1:
the lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves
Synonym: D-layer
| Wikipedia: D region |
The D region is the portion of the ionosphere that exists approximately 50 to 95 km above the surface of the Earth.
Note: Attenuation of radio waves, caused by ionospheric free-electron density generated by solar radiation, is pronounced during daylight hours. Because solar radiation is not present at night, ionization ceases, and hence attenuation of radio waves ceases.
References
This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C" (in support of MIL-STD-188).
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Learn More
 | waveguide propagation (communications) |
| ionospheric D scatter meteor burst (geophysics) |
| DMD (technology) |
Help us answer these
 | What are the ionized e-layer and ionized d-layer? |
| High freqency waves are reflected by d layer? |
| Why are the layers of the atmosphere called d e and f? |
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Copyrights:
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 | Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved. Read more |
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| WordNet. WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved. Read more |
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| Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "D region". Read more |
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