Peculiar transient events in the Schumann resonance band and their possible explanation |
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| Affiliation: | 1. Comenius University, Faculty of Mathematics, Physics and Informatics, Department of Astronomy, Physics of the Earth and Meteorology, Mlynská dolina F-1, 842 48 Bratislava, Slovak Republic;2. Geodetic and Geophysical Research Institute of Hungarian Academy of Sciences, Csatkai u. 6-8, PO Box 5, H-9401 Sopron, Hungary;3. QBSW, a.s., Prievozská 6, 821 09 Bratislava, Slovak Republic;1. Institute of Atmospheric Physics of ASCR, Prague, Czech Republic;2. Rutherford Appleton Laboratory, Chilton, United Kingdom;1. Dokuz Eylül University, The Graduate School of Natural and Applied Sciences, İzmir, Turkey;2. Dokuz Eylül University, Department of Mechanical Engineering, İzmir, Turkey;3. İzmir Kâtip Çelebi University, Department of Mechatronics Engineering, İzmir, Turkey;1. College of Materials Science and Engineering, State Key Laboratory of New Textile Materials & Advanced Processing Technology, Wuhan Textile University, Wuhan, 430200, China;2. School of Electronic and Electrical Engineering, Wuhan Textile University, Wuhan, 430200, China;3. Guangxi Key Laboratory of Calcium Carbonate Resources Comprehensive Utilization, Hezhou University, Hezhou, 0774, China;4. State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, Qingdao, 266071, China |
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| Abstract: | Superimposed on the continuous Schumann resonance (SR) background in the extremely low frequency (ELF) band, transient signals (e.g. bursts) can be observed, which originate from intense lightning discharges occurring at different locations on the globe. From the many transients that were observed at the Astronomical and Geophysical Observatory (AGO) of Comenius University near Modra, western Slovakia, in the vertical electric field component mainly during May and June of 2006, a peculiar group of events could be recognized. According to the waveform analysis, these peculiar events in most cases consist of two overlapping transients with a characteristic time difference of 0.13–0.15 s between the onsets. On the other hand, the spectrum of these peculiar transients showed discernible SR peaks for higher modes as well (n>7). The same events could be found in the records of the Széchenyi István Geophysical Observatory of the Geodetic and Geophysical Research Institute of the Hungarian Academy of Sciences near Nagycenk, Hungary (NCK). The natural origin of the peculiar events was verified from the NCK data and the source location was determined from the second transient. The results suggest that the two consecutive transients originated in the same thunderstorm. Furthermore, the phase spectrum analysis indicates that the sources have coherently excited the Earth-ionosphere cavity. These findings seem to support the idea that electromagnetic waves orbiting the Earth might trigger lightning discharges. The possibility that electromagnetic waves may trigger discharges was first considered by Nikola Tesla. |
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