Since 1985, the authors have been taking part in the triggered lightning experiments in winter, at the site of Okushishiku, Ishikawa, for the purpose of observing the entire lightning current waveforms with coaxial shunt resistors and an electro- optical measuring system. As the results, extra-fast current changes of the order of 1,000kA/μ s were recognized by the sharp pulse records superposed on the positive current waveform obtained by a shunt resistor of relatively high residual inductance.
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