F region

(redirected from F2 layer)
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Related to F2 layer: F1 layer
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Synonyms for F region

the highest region of the ionosphere (from 90 to 600 miles up) which contains the highest concentration of free electrons and is most useful for long-range radio transmission

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References in periodicals archive ?
An important feature is that the maximum electron density of F2 layer (NmF2) is larger in winter than in summer, in spite of the fact that the solar zenith angle is smaller in summer.
Hence, the F2 layer rises to higher altitude and causes a decrease in foF2 such that there is an increase in the ratio of [N.sub.2]/O.
* The F2 layer extends from about 250 to 400 km above the Earth.