Function: noun
Date: 1930
: the part of the ionosphere occurring between about 55 and 80 miles (90 and 130 kilometers) above the surface of the earth and containing the daytime E layer and the sporadic E layer
Function: noun
Date: 1930
: the part of the ionosphere occurring between about 55 and 80 miles (90 and 130 kilometers) above the surface of the earth and containing the daytime E layer and the sporadic E layer
Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012