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18. What determines the ratio of the amplitudes of the vertical and horizontal components of the...

18. What determines the ratio of the amplitudes of the vertical and horizontal components of the electric field in a wave propagating along the Earth's surface?
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In the case of finite conducting earth and wideband measurement,the ratio of the amplitudes of the vertical and horizontal components of the electric field is proportional to the the ground conductivity of the earth's surface.

in the frequency domain the ratio is given as

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