f layer

f lay·er
F f


    • US Pronunciation
    • US IPA
    • [ef ley-er]
    • /ɛf ˈleɪ ər/
    • US Pronunciation
    • US IPA
    • [ef ley-er]
    • /ɛf ˈleɪ ər/

Definitions of f layer words

  • noun f layer 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. 1
  • noun f layer the two dense layers of ions in the F region of the ionosphere that are used to reflect long-range radio signals: the F1 layer, at an altitude of c. 200 to 300 km (c. 125 to 185 miles), exists during the day, and the permanent F2 layer, or Appleton layer, is at c. 225 to 400 km (c. 140 to 250 miles) 0

Information block about the term

Origin of f layer

First appearance:

before 1925
One of the 11% newest English words
First recorded in 1925-30

Historical Comparancy

Parts of speech for F layer


f layer popularity

A pretty common term. Usually people know it’s meaning, but prefer to use a more spread out synonym. About 43% of English native speakers know the meaning and use word.
According to our data about 50% of words is more used. This is a rare but used term. It occurs in the pages of specialized literature and in the speech of educated people.

f layer usage trend in Literature

This diagram is provided by Google Ngram Viewer

See also

Matching words

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