Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun appleton_layer

1 sense of appleton layer

Sense 1
Appleton layer, F layer, 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)
       INSTANCE OF=> region, part -- (the extended spatial location of something; "the farming regions of France"; "religions in all parts of the world"; "regions of outer space")