D region

D region

n.

See D layer.

D region

or

D 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]

Thesaurus

Noun

1.

D region - the lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves D-layer ionosphere - the outer region of the Earth's atmosphere; contains a high concentration of free electrons

Translations

regione D