Appleton layer
/ˈaplt(ə)n ˌleɪə/Atmospheric Physics. Now disused
noun
The upper or F stratum of the ionosphere, above the E (or Heaviside) layer; = F-layer.
- Appleton himself used the term F-layer for this stratum..
Origin
1930s; earliest use found in The Fresno Bee. From the name of Edward V. Appleton, British physicist, who discovered the layer + layer.