Generation of VHF radio emissions by electric discharges in the lower atmosphere over a seismic region |
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| Authors: | VM Sorokin YuYa Ruzhin AK Yaschenko M Hayakawa |
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| Institution: | 1. Puskov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (IZMIRAN), Russian Academy of Sciences, Troitsk, Moscow Region 142190, Russian Federation;2. The University of Electro-Communications, Department of Electronic Engineering, Chofu Tokyo, Japan;1. Department of Information Systems & Operations Management, The University of Auckland Business School, Owen G Glenn Building, Auckland, New Zealand;2. Department of Information Systems, School of Computing, National University of Singapore (NUS), Singapore;1. Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran;2. SimEx/FLOW, Engineering Mechanics, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden;3. Swedish e-Science Research Centre (SeRC), Stockholm, Sweden;4. Division of Robotics, Perception, and Learning, School of EECS, KTH Royal Institute of Technology, Stockholm, Sweden |
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| Abstract: | Observational data of the seismic related VHF radio emissions at 41 and 53 MHz obtained at the four stations of Create Island are presented. The epicenter of EQs is located at the distance more than 300 km behind the horizon. It was shown that VHF radiation is generated at the altitudes 1–10 km in the atmosphere over the epicenter of EQs. The theory of generation of electromagnetic radiation by random electric discharges was developed. These discharges are excited by DC electric field enhanced up to the breakdown value in the atmosphere. The field is connected with the electric current flowing in the atmosphere–ionosphere circuit, whose source is generated by convective transport of charged aerosols, which are injected in the atmosphere by soil gases during the enhancement of seismicity. Calculations of the spectrum of electromagnetic radiation are derived, and the theoretical results are confirmed by observation data. |
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