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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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.
A STUDY OF THE SEASONAL VARIATION OF IONOSPHERIC ELECTRON DENSITY OVER BAGHDAD (A CASE STUDY)
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.
Variations of scale height at F-region peak based on ionosonde measurements during solar maximum over the crest of equatorial ionization anomaly region
* The F2 layer extends from about 250 to 400 km above the Earth.
Communications EW, part 2 -- HF propagation. (EW101)
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