Definition of Appleton layer in English:

Appleton layer

noun

Atmospheric Physics
disused
  • The upper or F stratum of the ionosphere, above the E (or Heaviside) layer; = "F-layer".

Origin

1930s; earliest use found in The Fresno Bee. From the name of Edward V. Appleton, British physicist, who discovered the layer + layer.

Pronunciation

Appleton layer

/ˈaplt(ə)n ˌleɪə/