appleton layer

Noun

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

F layer, F region

ionosphere - the outer region of the Earth's atmosphere; contains a high concentration of free electrons

region, part - the extended spatial location of something; "the farming regions of France"; "religions in all parts of the world"; "regions of outer space"

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