What is another word for f layer?
Pronunciation: [ˈɛf lˈe͡ɪə] (IPA) 
The ionospheric F layer is an important region in the atmosphere created by ionization of the gaseous elements through the absorption of sunlight. This layer plays a significant role in radio communication as it reflects radio waves back to the Earth's surface. Synonyms for the term "F layer" include the Appleton layer, F region, F2 layer, or ionospheric F region. The Appleton layer is named after the British physicist, Edward Appleton, who discovered the F region in the ionosphere during World War II. The F2 layer, on the other hand, is the highest part of the F region, and it reflects high-frequency (HF, 3 to 30 MHz) radio signals back to the Earth.
