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Definition of F2 layer
: the upper of the two layers into which the F region of the ionosphere splits in the daytime at varying heights from about 120 miles (200 kilometers) to more than 300 miles (500 kilometers) above the earth
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“F2 layer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/F2%20layer. Accessed 6 May. 2021.
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Time Traveler for F2 layer
The first known use of F2 layer was in 1933
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