Analysis on lightning electromagnetic fields received by antenna and electric field change instrument

Based on the radiation of the transient electromagnetic fields in lightning discharge channel, we establish the simulated model of lightning channel in the laboratory and analyze the data and waveform, which are received by the low frequency magnetic antenna and the plate capacitance electric field change instrument. Thus we draw some conclusions. In the experiment, the energy of lightning current is mainly concentrated in the low-frequency stage, and the difference of energy between two frequency point decreases with the frequency growth. The waveform of plate capacitance appears after that of magnetic antenna. As the impulse current increasing, the coupling amplitude and energy of the antenna have an increased trend and the growth of the magnetic antenna is more stable. When distance is further, the amplitude and energy of the antenna present a tendency of decrease. And the forepart is steep and the back is flat. The results have some significance on the research of lightning return stroke and lightning electromagnetic fields.