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Effect of solar flares on Schumann resonance frequencies

Reaction is analyzed of Schumann resonance (SR) frequencies on the recent solar X-ray flares. Until now, no convincing evidence was presented for the influence of solar X-rays on the SR peak frequencies owing to its masking both by the regular diurnal variations and random fluctuations. We worked out a special technique that implies weighted average frequency (WAF) and thus reveals the simultaneous sharp variation present in all resonance modes. Statistical processing of experimental WAF allowed us to infer the relationship between the SR records and the intensity of solar X-rays: an increase of the weighted frequency is proportional to the logarithm of the X-ray intensity in the 1.7 power. The observed alterations of WAF were then assigned to equivalent alterations of the “magnetic” characteristic height of the “knee” profile of ionosphere conductivity. Finally, the extremely low frequency data were compared with the published results on the very low frequency transmissions.