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Grid-cell combination in 3D-FDTD modeling of ELF propagation of the earth

In this paper, we have developed a model of extremely low frequency (ELF) wave propagation based on an advanced three-dimensional finite difference time-domain (3D-FDTD) method. We have studied the Schumann Resonances (SR) of the earth and three different altitude profiles of conductivity in the lossy Earth-Ionosphere Cavity. The eigen-frequencies of the model have been obtained, and the global averages of the vertical Er and tangential Eθ components for these three different conductivity models have been investigated.