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The Cooray-Rubinstein (CR) formula is one of the most popular techniques used to take into account the finite ground conductivity in the evaluation of the radial component of the lightning return stroke electric field. Nevertheless, one difficulty lies in its application: as it is expressed in the frequency domain, it can be difficult to code it in time domain simulation programs for lightning-induced...
An analysis of spurious solutions that often plague finite-difference time-domain solvers supplemented with certain transparent boundary conditions (TBC) is presented. It is shown that the electric- and magnetic-field TBC kernels may support undesired spurious modes. A combined-field TBC kernel is proposed that does not allow for the buildup of resonant modes. Its functionality is demonstrated by...
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