Appleton layer

(redirected from F2 layer)
Also found in: Thesaurus, Encyclopedia.
Related to F2 layer: F1 layer

Appleton layer

n
(Physical Geography) the F region of the ionosphere
[C20: named after Sir Edward Appleton]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.Appleton layer - 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
ionosphere - the outer region of the Earth's atmosphere; contains a high concentration of free electrons
References in periodicals archive ?
Therefore, the electron density increases with an increment of the solar activity and height until it reaches its maximum at F2 layer peak.
Furthermore, the bottomside ionospheric electron density still increases from photoionization during daytime, which is associated with the increase in [[O.sup.+]] and uplift of the F2 layer to a higher altitudes, and it reduces the loss rate and thereby still increases the electron content around the F2 peak.
The neurons, or nodes, in the F2 layer represent input categories.