D REGION


Meaning of D REGION in English

transcription, транскрипция: [ noun ]

Date: 1930

: the lowest part of the ionosphere occurring approximately between 30 and 55 miles (50 and 90 kilometers) above the surface of the earth

Merriam-Webster's Collegiate English vocabulary.      Энциклопедический словарь английского языка Merriam Webster.