| 释义 |
D region
D region or D layern (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 ionosphereD 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 wavesD-layerionosphere - the outer region of the Earth's atmosphere; contains a high concentration of free electrons |
D region
D region[′dē ‚rē·jən] (geophysics) The region of ionosphere up to about 60 miles (97 kilometers) above the earth, below the E and F regions, in which the D layer forms. D region
Synonyms for D regionnoun the lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio wavesSynonymsRelated Words |