A New Approximate Method for Lightning-Radiated ELF/VLF Ground Wave Propagation over Intermediate Ranges

<div>The current moment waveshape (a) in the time domain and (b) in the frequency domain used for computing the lightning VLF radiation at an intermediate distance.</div>

International Journal of Antennas and Propagation

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Figure 2

Figure 2: A New Approximate Method for Lightning-Radiated ELF/VLF Ground Wave Propagation over Intermediate Ranges 