D layer

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D layer [′dē ‚lā·ər]

(geology)

The lower mantle of the earth, between a depth of 600 and 1800 miles (1000 and 2900 kilometers).

(geophysics)

The lowest layer of ionized air above the earth, occurring in the D region only in the daytime hemisphere; reflects frequencies below about 50 kilohertz and partially absorbs higher-frequency waves.

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