Cross-mode modulation effect in Schumann resonances

Details Cross-mode modulation effect in Schumann resonances Cross-mode modulation effect in Schumann resonances

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jastp..61..693y&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 61, Issue 9, p. 693-699.

Physics

1

Scientific paper

Nonlinear interactions of the ELF (4-40 Hz) signals excited by worldwide lightning activity in the Earth-ionosphere cavity are investigated. A special algorithm for detecting weak nonlinearities, based on the calculation of a coherence function between the received signal and the multiplicative response of a digital analyzer, has been developed. Using long-term observations of the ELF signals, combination lines at double, sum and difference frequencies of the first three Schumann modes were detected. Possible mechanisms for the cross-modulation due to natural nonlinear effects in the atmosphere and lower ionosphere are discussed.

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