F2 layer

noun
\ ˈef-ˈtü- \

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

First Known Use of F2 layer

1933, in the meaning defined above

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Dictionary Entries near F2 layer

F

F1 layer

F2F

F2 layer

FA

fa

FAA

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The first known use of F2 layer was in 1933

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