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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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Merriam-Webster unabridgedWords at Play
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Time Traveler for F2 layer
The first known use of F2 layer was in 1933
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