D layer


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Related to D layer: Gutenberg Discontinuity

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.

D layer


n.
the lowest region of the ionosphere, at an altitude of ab. 50 mi. (80 km).
[1930–35]
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