F region

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F region

n.

F region

n
(General Physics) the highest region of the ionosphere, extending from a height of about 150 kilometres to about 1000 kilometres. It contains the highest proportion of free electrons and is the most useful region for long-range radio transmission. Also called: Appleton layer See also ionosphere
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Noun1.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
ionosphere - the outer region of the Earth's atmosphere; contains a high concentration of free electrons
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References in periodicals archive ?
Hengeveld and Van Lier (Submitted), seeking to establish a unified analysis of lexically specified and complex events, invoke an additional f-layer, which contains the nuclear predication as its head, as exemplified in (11).
Here, we see ourselves confronted with the exact same problem; as soon as an additional f-layer is added to enable referentiality of the predication contained in the event, as proposed by Hengeveld and van Lier, the endocentric argument variable of that layer causes scope ambiguity.