Ground wave
A wave that is propagated over the earth and is ordinarily affected by the presence of the ground and the troposphere. The ground wave includes all components of a radio wave over the earth except ionospheric and tropospheric waves.
Note: The ground wave is refracted because of variations in the dielectric constant of the troposphere including the condition known as the surface duct.
Reference: I.R.E.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
