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

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 f...

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Bibliographic Details
Published in:Journal of atmospheric and solar-terrestrial physics 2010-04, Vol.72 (5), p.448-456
Main Authors: Surkov, V.V., Matsudo, Y., Hayakawa, M., Goncharov, S.V.
Format: Article
Language:English
Subjects:
Positive lightning
Power spectrum
Schumann resonances
Sprites
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Summary: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.
ISSN:1364-6826
1879-1824
DOI:10.1016/j.jastp.2010.01.001