Non-linear interaction between Schumann resonances and HF signals

Details Non-linear interaction between Schumann resonances and HF signals Non-linear interaction between Schumann resonances and HF signals

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jastp..59..335y&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, v. 59, p. 335-342.

Physics

6

Scientific paper

The effect of cross-modulation between Schumann resonances (SR) and HF (15 MHz) round-the-world signals (RWS) has been established experimentally. The peaks near the frequencies 8, 14, 20 Hz were discovered in the spectra of the RWS. These maxima correspond to three first modes of SR. A theoretical model which explains the effect of cross-modulation is proposed. The interaction of the signals is due to the electron heating by SR fields in the D-layer of the ionosphere. This leads in its turn to the modulation of the electron collision frequency and to the attenuation of RWS. It is essential that the fair weather electric field in the ionosphere is taken into account. The influence of this field leads to a linear dependence of the electron temperature variations on the field strength of SR.

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