Some inferences on the role of lower positive charge region in facilitating different types of lightning
Some inferences on the role of lower positive charge region in facilitating different types of lightning
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DOI：
10.1029/2008gl036783
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发表时间：
2009-03-13
影响因子：
5.2
通讯作者：
Rakov, Vladimir A.
中科院分区：
文献类型：
--
作者：
Nag, Amitabh;Rakov, Vladimir A.
一般认为，较低的正电荷区可以增强主负电荷区底部的电场，从而促进带负电荷的引线向地面发射。另一方面，过多的低正电荷区域的存在可能通过“阻挡”下降的负电荷前导到达地面的进程，从而“转换”潜在的云对地闪光到云内（或云对空）闪光，从而防止云对地负放电的发生。假设初步击穿脉冲序列是向下延伸的负先导通道与较低的正电荷区相互作用的表现，我们定性地检验了闪电类型对该电荷区大小的依赖性。引用本文：Nag， A, and V. A. Rakov(2009)，关于低正电荷区在促进不同类型闪电中的作用的一些推论，地球物理学报。卷。， 36, L05815, doi:10.1029/2008GL036783。
It is generally thought that the lower positive charge region serves to enhance the electric field at the bottom of the main negative charge region and thereby facilitate the launching of a negatively-charged leader toward ground. On the other hand, the presence of excessive lower positive charge region may prevent the occurrence of negative cloud-to-ground discharges by "blocking'' the progression of descending negative leader from reaching ground and thus "converting'' the potential cloud-to-ground flash to an intracloud (or cloud-to-air) one. Assuming that the preliminary breakdown pulse train is a manifestation of interaction of a downward- extending negative leader channel with the lower positive charge region, we qualitatively examine the inferred dependence of lightning type on the magnitude of this charge region. Citation: Nag, A., and V. A. Rakov (2009), Some inferences on the role of lower positive charge region in facilitating different types of lightning, Geophys. Res. Lett., 36, L05815, doi:10.1029/2008GL036783.