D region
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D region
n.
See D layer.
D region
orD 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
D layer
n.
the lowest region of the ionosphere, at an altitude of ab. 50 mi. (80 km).
[1930–35]
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Noun | 1. | 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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