Gang Liu, Xiaolei Wang, H. Cai, M. Liao, Shangmao Hu, Yu Liu
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引用次数: 0
摘要
基于高速视频观测,研究了一次正云对地闪电长持续电流(CC)阶段反冲前导(RL)活动的产生和传播特性。主要发现如下:丰富的RL活动主要发生在三个先前形成的积极领导通道上。部分RL事件呈现明显的双向传播,两端二维平均传播速度在8.10 × 105 m/s ~ 5.99 × 106 m/s之间,以106 m/s量级为主。RL活动表现出一些有趣的特征,即在一个发育过程中,在其正端形成的分支领导提示可以交替发展,下一次启动RL可以遵循这些分支的任何一条路径;在RL通道衰减一段时间后,RL可以在其正端进一步发育并通过分支的先导尖重新照亮;RL在连接有源正放电引线后传播,在背景CC电流上产生m分量,亮度大,持续时间长。
Optical Characteristics of Recoil Leader Activity in one Positive Cloud-to-ground Lightning Flash
The initiation and propagation characteristics of recoil leader (RL) activity during the long continuing current (CC) stage of one positive cloud-to-ground (CG) lightning flash have been investigated based on high-speed video observations. The main findings are as follows: Abundant RL activity mainly occurs along three previously formed positive leader channels. Some RL events show apparent bidirectional propagation, and the two-dimensional (2-D) average propagation speed ranges from 8.10x105 m/s to 5.99x106 m/s for both ends, mainly in the order of 106 m/s. RL activity shows some interesting characteristics that the branched leader tips formed on its positive end can develop alternately during one development process and RL initiates next time can follow either path of these branches; after RL channel has been decayed for some time, RL can further develop and reilluminate on its positive end with the branched leader tips; RL propagation upon connection to the active positive discharge leader can cause an M-component on the background CC current, with great luminosity and a rather long duration.