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Telecommunications and Radio Engineering
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ISSN Print: 0040-2508
ISSN Online: 1943-6009

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Telecommunications and Radio Engineering

DOI: 10.1615/TelecomRadEng.v77.i8.60
pages 727-746

MODIFICATIONS OF MESOSPHERIC CONDUCTIVITY IN SUDDEN IONOSPHERE DISTURBANCES AND CHANGES OF THE SCHUMANN RESONANCE FREQUENCIES

I. G. Kudintseva
V. Karazin National University of Kharkov, 4, Svoboda sq., Kharkov, 61077, Ukraine
Yu. P. Galyuk
Saint-Petersburg State University, 35 University Ave., St.-Petersburg, Peter Hoff 198504, Russia
A. P. Nickolaenko
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
Masashi Hayakawa
Hayakawa Institute of Seismo Electromagnetics Co. Ltd.(Hi-SEM), The University of Electro-Communications (UEC) Alliance Center #521, Advanced & Wireless and Communications Research Center, UEC, Chofu, Tokyo, 182-8585, Japan

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.