Definition of Heaviside layer in US English:

Heaviside layer

(also Heaviside–Kennelly layer)


  • another name for E layer
    • ‘It is shown that the Heaviside layer is probably quite irregular, and that refraction of the traveling waves is probably existent’
    • ‘Appleton conducted an experiment to prove that the Heaviside layer existed, and its height.’
    • ‘The Heaviside layer may vary in height from 50 kilometers in the daytime to 100 kilometers at night.’
    • ‘Terrestrial phenomena which I have noted conclusively show that there is no Heaviside layer, or, if it exists, it is of no effect.’
    • ‘In the morning, when the Heaviside layers go back where they belong, you wake up to static.’


Early 20th century: named after O. Heaviside (see Heaviside, Oliver) and A. E. Kennelly (see Kennelly, Arthur Edwin).