What is another word for d-layer?
Pronunciation: [dˈiːlˈe͡ɪə] (IPA) 
The D-layer, also known as the Appleton layer, is an ionospheric region located between 60 to 90 km above the Earth's surface. It is responsible for absorbing high frequency radio waves and is most prominent during daylight hours. Synonyms for the D-layer include the E-layer, which is found at a slightly higher altitude, and the F-layer, which is located even higher in the ionosphere. The D-region and D-region ionosphere are also commonly used to refer to this layer. As scientists continue to study the ionosphere and its impact on radio wave communication, new terms and synonyms for the D-layer may emerge.
