Physical properties of radiation fields produced by multiple in-cloud lightning discharges

被引:2
作者
Lee, BH
Lee, SC
Ahn, CH
Kawamura, T
机构
[1] Inha Univ, Sch Elect & Comp Engn, Nam Ku, Inchon 402751, South Korea
[2] Shibaura Inst Technol, Ctr Energy & Environm, Minato Ku, Tokyo 1088548, Japan
来源
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS | 2001年 / 40卷 / 01期
关键词
electromagnetic field; lightning phenomenon; multiple in-cloud lightning discharge; field parameter analysis; bipolar pulse; stepped leader;
D O I
10.1143/JJAP.40.299
中图分类号
O59 [应用物理学];
学科分类号
摘要
This paper describes some physical properties and statistical analyses of radiation fields associated with multiple in-cloud lightning discharges. A wide-band waveform recording system was employed to analyze the time-domain characteristics of the radiation fields. The radiation fields produced by in-cloud lightning discharges were significantly different from cloud-to-ground return stroke fields and showed pronounced bipolar pulse peak amplitudes comparable to those of cloud-to-ground return stroke fields. The time intervals between the subsequent strokes for both the positive and negative radiation fields decrease as the stroke order increases. The ratio of the peak of the subsequent strokes to the first stroke peak is distributed over a wide range. Little difference was observed compared with the results for both the positive and negative polarities. The time intervals between the superimposing narrow stepwise pulses in the initial half-cycle of the pronounced bipolar pulse were in the range of less than 12 mus and the mean values for the positive and negative polarities were 4.33 mus and 4.78 mus. respectively. The statistics on the parameters of the electric and magnetic field waveforms seem to provide a good quantitative estimate of the lightning protection device response to the electromagnetic pulse effects of in-cloud lightning discharges.
引用
收藏
页码:299 / 306
页数:8
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