Simultaneous observation on electric field changes at 60 m and 550 m from altitude‐triggered lightning flashes
Simultaneous observation on electric field changes at 60 m and 550 m from altitude‐triggered lightning flashes
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DOI：
10.1029/2008rs003866
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发表时间：
2009-02
期刊：
影响因子：
1.6
通讯作者：
Qilin Zhang;X. Qie;Zhenhui Wang;Tinglong Zhang;Jing Yang
中科院分区：
文献类型：
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作者：
Qilin Zhang;X. Qie;Zhenhui Wang;Tinglong Zhang;Jing Yang
本文报道了在60 m和550 m两个高度触发的闪电放电的垂直电场变化的测量结果，并使用两个先导模型对数据进行了分析。结果表明：60 m处双向先导/回击产生的磁场变化波形为不对称的V形，半峰宽约为100 μs。60 m和550 m处的后续镖首/回击序列的场波形也呈现不对称的V形，这两个地点的V形半峰宽度分别为14 μs和103 μs。场波形宽度的差异可以用源电荷先导模型来解释。在60 m和550 m处，镖首的电场变化分别为17.9 kV/m和1.3 kV/m，产生d−1.18的水平距离依赖性。在非常近的距离（几十到几百米或更短），镖首磁场变化的幅度与随后的回击没有什么不同。
This paper reports the vertical electric field changes measured at 60 m and 550 m for two altitude‐triggered lightning discharges and analyzes the data with two leader models. The results show that the field change waveform produced by bidirectional leader/return stroke at 60 m is asymmetrical V‐shaped with the half‐peak width of about 100 μs. The field waveform of the following dart leader/return stroke sequences at 60 m and 550 m also appear asymmetrical V‐shaped, and the half‐peak widths of the V‐shaped for these two sites are 14 μs and 103 μs, respectively. The difference in the width of field waveforms can be explained by using the source charge leader model. The electric field changes of the dart leaders at 60 m and 550 m are 17.9 kV/m and 1.3 kV/m, respectively, yielding a horizontal distance dependence of d−1.18. At very close ranges (a few tens to hundreds of meters or less), the magnitude of the dart leader field change is not different from that of the following return stroke.