Estimation of lightning and sprite parameters based on observation of sprite-producing lightning power spectra

Details Estimation of lightning and sprite parameters based on observation of sprite-producing lightning power spectra Estimation of lightning and sprite parameters based on observation of sprite-producing lightning power spectra

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jastp..72..448s&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 72, Issue 5-6, p. 448-456.

Physics

Sprites, Positive Lightning, Power Spectrum, Schumann Resonances

Scientific paper

Spectrograms and ELF power spectra of magnetic variations originated from sprite-producing lightning discharges have been analyzed to extract both parent lightning and sprite parameters. Some of the spectrograms and power spectra have been found to have approximately quasi-oscillatory shape in the frequency range 0-40 Hz with maximum repetition period about 15-20 Hz. A theory predicts that this interesting peculiarity of the power spectra can be due to interference between electromagnetic fields originated from the parent lightning discharge and from the sprite. A smooth envelope of the power spectrum was shown to have a form of damped oscillations with period close to reciprocal value of sprite lag time. A technique of extracting sprite parameters based on the sprite-producing lightning power spectrum is proposed. The lack of the first Schumann resonance and other features occasionally observed in spectral resonance structure were also discussed.

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