F region

proper noun

The middle layer of the ionosphere, located 90 km (56 mi) to 150 km (93 mi) above the surface of the Earth.

Similar
Appleton layerAppleton-Barnett layerF layer
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Meanings

proper nounthe F region

alternative F-region

  1. The middle layer of the ionosphere, located 90 km (56 mi) to 150 km (93 mi) above the surface of the Earth.

    Synonyms: Appleton layer, Appleton-Barnett layer, F layer

Synonyms & antonyms

proper nounThe middle layer of the ionosphere, located 90 km (56 mi) to 150 km (93 mi) above the surface of the Earth.

Similar
Appleton layerAppleton-Barnett layerF layer
Also see
appleton-barnett layerappleton layerf layer
Cite this entry
APA

F region. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/F%20region

MLA

“F region.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/F%20region. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “F region,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/F%20region.

Source: F region on Wiktionary, CC BY-SA 4.0.