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Dictionary

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.

flay

F.L.B

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