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Astro*Dictionary by Michael Erlewine





1 article for "D-region"

D-region - [ ]

Lowest ionospheric region, at altitudes of about 70 to 90 km (40 to 55 miles). The D-region differs from the other ionospheric regions (denoted E and F) in that its free electrons almost totally disappear during the night because they recombine with oxygen ions to form oxygen molecules.

See also:
♦ Atmosphere of Earth


Astro*Index Copyright © 1997 Michael Erlewine