Analyses on Regular Pulses Burst in Electromagnetism Radiation of Lightning
Updatetime:2011-01-10From:
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A special lightning discharge phenomena named as Regular Pulses Bursts(RPBs) was analysed. The results show that the RPBs exist in all 69 lightning discharges during 30 minutes. The 190 RPBs in six typical lightning was detailedly analysed. The typical width of pulses was about 1 μs, and time interval varied from 4 to 8 μs. Four types, normal RPBs, back RPBs, symmetry RPBs, reversal RPBs were classified according to the time interval and pulse polarity. There was no obvious difference between RPBs in negative cloud to ground(CG) lightning and that in intracloud lightning(IC), but in positive CGs most of the RPBs′ polarity is changeful. The analysis that, the variety of RPBs may be corresponding tothe extended process of streamer among few small charge region.
RPBs classification. The upper waveform is relative change of VHF radiation and the lower waveform is the relative change of fast electric field in the picture frame. (Picture/Plateau Meteorology) |
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