The magnetic radiation fields produced by positive lightning return strokes during winter thuderstorms in Japan have been Fourier-analyzed to determine amplitude spectra from 100 kHz to 10 MHz. The fields were recorded at the tip of a peninsula where the fiel:d propagation from the lightning sources to the recording site was entirely over salt water. The spectra for positive return strokes show an f-1 frequency dependence from 100 kH~ to 400 kHz, an f-2 dependence between 400 kHz and 2 MHz. In the 100
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