F region

(redirected from F1 layer)
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  • noun

Synonyms for 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

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References in periodicals archive ?
Seasonal variations of the D, E and F1 layers correspond to the highest angle of the sun; and thus the ionization density of these layers is greatest during the summer.
from the F1 layer Depending on the local density of various layers, there can also be hops from the F layer to the E layer, back to the F layer, and finally to the Earth.
The F1 layer exists only during the daytime and is more noticeable during the summer months, during periods of high sunspot activity and during ionospheric storms.
LW2: weight in the cryptic layer for output layer, b1 and b2: validity threshold in cryptic and output layer respectively, and f1 layers respectively [11].