Appleton layer(redirected from F2 layer)
Also found in: Thesaurus, Encyclopedia.
Related to F2 layer: F1 layer
(Physical Geography) the F region of the ionosphere
[C20: named after Sir Edward Appleton]
Switch to new thesaurus
|Noun||1.||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