Science Fair Project Encyclopedia
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.
Source: from Federal Standard 1037C and from MIL-STD-188
Last updated: 08-14-2005 17:31:33
10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details