The Radio And Very Low Frequency (VLF) Electromagnetic Response Of A Layered Earth Media With Variable Dielectric Permittivity
A set of electromagnetic sounding models was formulated using earth parameters such as conductivity, dielectric permittivity, permeability, surface wave impedance; adopting the Maxwell’s equation as the basis and assuming the earth to be a layered media. The amplitude of the modification factor to the wave tilt, Q, the phase of Q and the reflection coefficient, are the computed response parameters studied over a stratified earth media with variable dielectric permittivity. A radio frequency of 125 KHz and a very low frequency (VLF) of 20 KHz were used in the computations and the field parameters studied over a dimensionless induction number, B. The application of the radio frequency over a two-layer media with conductive basement, revealed that the dielectric permittivity has greater influence on the response parameters, compared with the case when a very low frequency (VLF) was used. However, a remarkable influence was observed with both frequencies over a resistive basement.
Keyword: wave tilt, dielectric permittivity, contaminant, layered earth