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.
The F-layer consists of one layer at night, but during the day, a deformation often forms creating layers labeled F 1 and F 2 .