D region

English

Alternative forms

• D-region

Etymology

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

Proper noun

the D region

1. The innermost layer of the ionosphere, located 48 km (30 mi) to 90 km (56 mi) above the surface of the Earth.

Synonyms

• D layer

Further reading

• D region on Wikipedia.Wikipedia