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F layer



Physics.
the highest of the radio-reflective ionospheric layers, beginning at an altitude of ab. 80 mi. (130 km) and consisting of two parts, the lower part (F1 layer) being detectable in the daytime only, the higher (F 2layer or Appleton layer) being constant and constituting the ionospheric layer most favorable for long-range radio communication.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

flayF.L.B
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