Interpretation in terms of gyrotropic waves of Schumann-resonance-like line emissions observed at Nakatsugawa in possible association with nearby Japanese earthquakes |
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| Authors: | M Hayakawa K Ohta VM Sorokin AK Yaschenko J Izutsu Y Hobara AP Nickolaenko |
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| Institution: | 1. University of Electro-Communications (UEC), Advanced Wireless Communications Research Center, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan;2. UEC, Research Station on Seismo Electromagnetics, Chofu, Tokyo, Japan;3. Chubu University, Department of Electronic Information Engineering, Matsumoto-cho 1200, Kasugai Aichi 487-8510, Japan;4. Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (IZMIRAN), Troitsk Town, Moscow Region 142190, Russia;5. Chubu University, Research Center of Earth Watch and Safety Net, Kasugai Aichi, Japan;6. Usikov Institute of Radiophysics and Electronics, Kharkov, Ukraine;1. Electronics-Telecommunications and Applications Lab, Physics Department University of Ioannina, 45110 Ioannina, Greece;2. Research Center for Astronomy and Applied Mathematics, Academy of Athens, 4 Soranou Efesiou str. 11527, Athens, Greece;3. Mariolopoulos-Kanaginis Foundation for the Environmental Sciences, 30-32 Patriarchou Ioakim Str, Athens 106 75, Greece;1. Hayakawa Institute of Seismo Electromagnetics Co. Ltd. (Hi‐SEM), University of Electro‐Communications (UEC) Alliance Center, 1-1-1 Kojima-cho, Chofu, 182-0026, Japan;2. UEC, Advanced Wireless and Communications Research Center (AWCC), 1-5-1 Chofugaoka, Chofu, 182-8585, Japan;3. Chubu University, International Digital Earth Applied Science Research Center, 1200 Matsumoto-cho, Kasugai Aichi, 487-8585, Japan;4. Institute of Physics of the Earth (IPE), Russian Academy of Sciences, 123995, 10 Bolshaya Gruzinskaya, Moscow, Russia;5. A.Ya. Usikov Institute for Radio‐Physics and Electronics, National Academy of Sciences of Ukraine, Kharkov, Ukraine;6. Department of Applied Mathematics and Control Processes, Saint-Petersburg State University, 35, University Ave., Peterhof, Saint-Petersburg, 198504, Russia;7. Department of Mathematics and Informatics, V.N. Karazin Kharkov State University, Kharkov, Ukraine;1. Electrochemical Energy Conversion and Storage Systems Group, Institute for Power Electronics and Electrical Drives (ISEA), RWTH Aachen University, Jägerstrasse 17/19, 52066, Aachen, Germany;2. Institute for Power Generation and Storage Systems (PGS), E.ON ERC, RWTH Aachen University, Mathieustrasse 10, 52074 Aachen, Germany;3. Jülich Aachen Research Alliance, JARA-Energy, Templergraben 55, 52056 Aachen, Germany;4. Helmholtz Institute Münster (HI MS), IEK-12, Forschungszentrum Jülich, Jägerstrasse 17-19, 52066 Aachen, Germany |
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| Abstract: | The observation of ULF/ELF electromagnetic waves in the frequency range below 50 Hz has been continued at Nakatsugawa (in the Gifu prefecture), Japan since 1998. This paper summarizes anomalous Schumann resonance (SR) phenomena and SR-like line emissions observed at Nakatsugawa in possible association with recent nearby earthquakes (EQs) (the 2004 Mid-Niigata prefecture and the 2007 Noto-Hanto (peninsula) EQs), which have been already described in detail by Ohta et al. (2009). The intensity of particular modes of SR increased before these large EQs and the excitation of other anomalous SR-like line emissions also existed at the frequency shifted by about 2 Hz from the typical SR modes. Since temporal changes of the anomalous SR modes and line emissions are synchronous in time, there might be a possibility that the line emission is a consequence of the anomalous SR. In this paper we propose an interpretation of those anomalous phenomena in terms of excitation of gyrotropic waves due to input wave from below with a band from 15 to 20 Hz as an exciter. The theoretical computational results seem to be generally consistent with the observational finding. |
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