Abstract
We present a technique for detecting modifications of the peak frequencies of Schumann resonance during the sudden ionospheric disturbances (SID) caused by the solar X-ray flares. A SID is associated with a sharp lowering of ionosphere at the sunlit hemisphere during the solar flares, which decreases the average ionosphere height increases Schumann resonance frequencies. The resonance frequencies and the characteristic heights of ionosphere are computed using the full wave solution for SID of different intensity. Power spectra of EZ field are computed using the 2D telegraph equations for the uniform distribution of thunderstorms in the cavity for several observer positions relative to the solar terminator. The weighted average frequency was found and linear dependence was found of this frequency on the SID intensity and/or on alteration of magnetic characteristic height. Results might be used in interpretations of Schumann resonance observations and estimation of ionosphere modification.
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