: the lower of the two layers into which the F region of the ionosphere splits in the daytime that occurs at varying heights from about 80 to 120 miles (130 to 200 kilometers) above the earth's surface
Word History
First Known Use
1933, in the meaning defined above
Cite this Entry
“F1 layer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/F1%20layer. Accessed 16 Apr. 2024.
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Britannica.com: Encyclopedia article about F1 layer
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