Lightning amplitude spectra in the interval from 100 kHz to 20 MHz

Details Lightning amplitude spectra in the interval from 100 kHz to 20 MHz Lightning amplitude spectra in the interval from 100 kHz to 20 MHz

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..931w&link_type=abstract

Geophysical Research Letters, vol. 8, Aug. 1981, p. 931-934.

Physics

20

Amplitude Distribution Analysis, Electric Fields, Fourier Analysis, Lightning, Spectrum Analysis, Fast Fourier Transformations, Waveforms

Scientific paper

The electric radiation fields produced by lightning return strokes, stepped leaders, and intracloud discharge processes have been Fourier-analyzed to determine amplitude spectra for these processes from about 100 kHz to 20 MHz. The fields were recorded under conditions where the lightning locations were known and where the field propagation from the lightning sources to the recording site was entirely over salt water. The spectra for return strokes show an f exp -1 frequency dependence from 100 kHz to 2 MHz, an f exp -2 dependence between 2 and 10 MHz, and an f exp -5 decrease above 10 MHz. In the 1 to 20 MHz range, the spectra of the initial fast transition in return strokes, the initial fast-rising portion of leader steps and the fast transitions in positive intracloud pulses are surprisingly similar.

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