Observations of the Wire Destruction and Plasma Channel Reestablishment Process During the Initial Stage of Triggered Lightning
Observations of the Wire Destruction and Plasma Channel Reestablishment Process During the Initial Stage of Triggered Lightning
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DOI：
10.1029/2019gl086001
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发表时间：
2020-02
影响因子：
5.2
通讯作者：
Shulei Li;Shi Qiu;Li-hua Shi;Yun Li;W. Dong
中科院分区：
文献类型：
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作者：
Shulei Li;Shi Qiu;Li-hua Shi;Yun Li;W. Dong
基于甚高频（VHF）测绘阵列、电磁场和高速视频等综合观测资料，分析了触发闪电初始阶段导线破坏和等离子体通道重建过程。VHF测图结果首次证实了重联过程和重联过程的详细放电过程。重连过程类似于前导/回击序列，而尝试重连过程涉及更复杂的放电。结果表明，由于丝材的不均匀性，丝材的多段先熔合，产生一系列丝材残留物。此后，向下延伸的VHF击穿分散在数百米的高空，随后发生类似反冲的事件，两者都发出相当弱的VHF辐射，并且没有观察到可检测的LF电磁场变化。结果表明，在尝试重连过程中，没有明显的电流流动或电荷移动。
The wire destruction and plasma channel reestablishment process during the initial stage of a triggered lightning is analyzed based on comprehensive observations, including very high frequency (VHF) mapping array, electric‐magnetic field, and high‐speed video. The detailed discharge processes in both the attempted reconnection process and reconnection process are firstly evidenced by VHF mapping results. The reconnection process is similar to a leader/return‐stroke sequence, while the attempted reconnection process involves more complicated discharges. It is shown that several segments of the wire are fused firstly due to inhomogeneity of the wire, resulting in a series of wire residues. Thereafter, downward extending VHF breakdowns dispersed over hundreds of meters in altitude followed by a recoil‐like event, both of which emitted fairly weak VHF radiation, and no detectable LF electromagnetic field change was observed. It is indicated that there are no significant current flowing or charges movement during the attempted reconnection process.