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A numerical solution for electromagnetic scattering from a two-dimensional earth model of arbitrary conductivity distribution has been developed and compared with analog model results. A frequency-domain variational integral is Fourier transformed in the strike direction, and a solution is obtained using the finite-element method for each of a finite number of harmonics or wavenumbers in transform space. The solution is obtained in terms of the secondary electric fields. Principally due to the inaccuracy associated with numerical derivatives of electric fields, the secondary magnetic field is computed by integrating over the scattering currents in harmonic space and is then inverse Fourier transformed.
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Lee et al. (1985) studied this question.
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