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F layer

noun, Physics.
the highest of the radio-reflective ionospheric layers, beginning at an altitude of about 80 miles (130 km) and consisting of two parts, the lower part (F layer) being detectable in the daytime only, the higher (F layer or Appleton layer) being constant and constituting the ionospheric layer most favorable for long-range radio communication.
Origin of F layer
First recorded in 1925-30

F1 layer

[ef wuhn] /ˈɛf ˈwʌn/
See under F layer. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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f1 layer in Science
F layer  
See F region.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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