Transient phenomena in positive cloud-to-ground lightning discharges
Transient phenomena in positive cloud-to-ground lightning discharges
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DOI：
10.1038/s42005-022-01087-8
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发表时间：
2022-12
影响因子：
5.5
通讯作者：
Z. Ding;V. Rakov;Yanan Zhu;M. D. Tran;I. Kereszy
中科院分区：
文献类型：
--
作者：
Z. Ding;V. Rakov;Yanan Zhu;M. D. Tran;I. Kereszy
正闪电对地放电（+CG）相对较少，研究也比负闪电（-CG）少得多。我们目前的观察不寻常的瞬态现象发生在+CG，并讨论其机制。其中之一是一个简短的电耦合到并发-CG启动从一个257米高的塔位于11公里的+CG通道。-CG闪光中的瞬态过程（中风）似乎导致+CG通道中的瞬态亮度增强（M分量）。在这些基本上同时发生的瞬变过程中，正电荷实际上是从塔位置处的地面中取出的，并在+CG通道的位置处注入到地面中。反冲领导人重新激活云底附近的衰变+CG分支，每个观察到造成一个短暂的亮度下降（下降），而不是预期的亮度增加，在+CG主通道。
Positive lightning discharges to ground (+CGs) are relatively rare and considerably less studied than negative ones (-CGs). We present observations of unusual transient phenomena occurring in +CGs and discuss their mechanisms. One of them is a brief electric coupling to a concurrent -CG initiated from a 257-m tall tower located 11 km from the +CG channel. A transient process (stroke) in the -CG flash appears to cause a transient luminosity enhancement (M-component) in the +CG channel. In the course of these essentially simultaneous transients, positive charge is in effect taken from the ground at the position of the tower and injected into the ground at the position of the +CG channel. Recoil leaders reactivating decayed +CG branches near the cloud base are each observed to cause a transient luminosity decrease (dip), as opposed to the expected luminosity increase, in the +CG main channel.