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

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Telecommunications and Radio Engineering

DOI: 10.1615/TelecomRadEng.v74.i11.60
pages 1025-1038

DISTURBANCES OF LOWER IONOSPHERE ABOVE CENTER OF EARTHQUAKE AND ANOMALY IN THE GLOBAL ELECTRO-MAGNETIC RESONANCE SIGNAL - PART 1: MODELS OF IONOSPHERE

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

ABSTRAKT

We model an effect on the Schumann resonance signal recorded in Japan of the ionosphere non-uniformity centered above the earthquake at Taiwan. Changes in the resonance spectrum occur due to interference of the direct radio wave with one reflected from the ionosphere modification above the earthquake. The first part addresses the typical models of ELF radio propagation constant and connects this with the vertical profile of atmospheric conductivity. The profile with a knee is analyzed, which is widely used for modeling the Schumann resonance. The four models are included used in literature for obtaining the frequency dependence of complex propagation constant of ELF radio waves. It is assumed that the pre-seismic and seismic activity locally reduces the height of the lower-boundary of the ionosphere above the earthquake. The maximum reduction reaches 20 km, and the symmetric perturbation is described along the radius by the Gauss curve of the scale of 1000 km.