Ground constants
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In telecommunications, ground constants are the electrical parameters of earth: electrical conductivity, σ, electrical permittivity, ε, and magnetic permeability, μ.
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
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This article incorporates public domain material from Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). (in support of MIL-STD-188).
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