Characteristics of the Radiation Field Waveforms Produced by Lightning Return Strokes

초록

Some features of the radiation field waveforms produced by lightning return strokes were investigated. The transient analyzer was used in conjunction with the electric and magnetic field measuring devices with frequency bandwidth of 200Hz to 1.6MHz and 270Hz to 2.3MHz, respectively. The initial peak of first return stroke fields is followed by several large subsidiary peaks with amplitudes which are a fraction of the initial peak and which decrease with time. The mean ratio of the subsidiary peak amplitudes to the first return stroke field peak is distributed over the ranges of 0.25∼0.8, and the time interval between the subsidiary peaks ranges from 5 to 15㎲.