Ground constants
From Infogalactic: the planetary knowledge core
In telecommunication, ground constants are the electrical parameters of earth, such as conductivity, permittivity, and magnetic permeability.
The values of these parameters vary with the local chemical composition and density of the Earth. For a propagating electromagnetic wave, such as a surface wave propagating along the surface of the Earth, these parameters vary with frequency and direction.
See also
References
This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C" (in support of MIL-STD-188).
