Optical and electric field signatures of lightning interaction with a 257-m tall tower in Florida
Optical and electric field signatures of lightning interaction with a 257-m tall tower in Florida
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DOI：
10.1016/j.epsr.2016.08.036
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发表时间：
2017-12
影响因子：
3.9
通讯作者：
Y. Zhu;V. Rakov;M. D. Tran
中科院分区：
文献类型：
--
作者：
Y. Zhu;V. Rakov;M. D. Tran
位于佛罗里达盖恩斯维尔（Gainesville）的闪电观测站同时获得了两次闪电（标记为1593和1594）的电场和高速摄像机记录。闪光1593是一个向上的负闪光，其向上的正先导起源于一个257米高的塔，位于距地球8.8公里处。它包含六个先导/回击序列，所有这些序列都沿着向上的先导路径发展，并终止于257米的塔。闪光1594是一个三冲程向下双极闪光，其第一冲程为正，终止于60米高的塔上。随后的两次撞击都是负的，并与闪光1593的六次撞击在同一座257米高的塔上终止。在257米高的塔上终止的所有冲程都表现出非常相似的窄双极电场波形，并具有阻尼振荡尾部。这些电场波形的特点进行检查，并在文献中发现类似的观察比较。
Simultaneous electric field and high-speed video camera records of two flashes, labeled 1593 and 1594, were obtained at the Lightning Observatory in Gainesville (LOG), Florida. Flash 1593 was an upward negative flash whose upward positive leader initiated from a 257-m high tower, located 8.8 km from LOG. It contained six leader/return-stroke sequences, all of which developed along the upward leader path and terminated on the 257-m tower. Flash 1594 was a three-stroke downward bipolar flash whose first stroke was positive and terminated on a 60-m tower. The two subsequent strokes were negative and terminated on the same 257-m tower as the six strokes of flash 1593. All strokes terminated on the 257-m tower exhibited very similar narrow bipolar electric field waveforms with damped oscillatory tails. Characteristics of those electric field waveforms are examined and compared to similar observations found in the literature.