Indirectly Measured Ambient Electric Fields for Lightning Initiation in Fast Breakdown Regions
Indirectly Measured Ambient Electric Fields for Lightning Initiation in Fast Breakdown Regions
复制标题
间接测量快速击穿区域雷电启动的环境电场
DOI：
10.1029/2019gl086089
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发表时间：
2020
影响因子：
5.2
通讯作者：
S. Cummer
中科院分区：
文献类型：
--
作者：
S. Cummer
我们报告了一种间接测量快速正击穿区域环境雷暴电场的新方法。对于放电快速击穿区域的给定几何形状，我们表明产生给定电荷矩变化所需的最小环境电场。我们将这种方法应用于 Rison 等人报告的两个事件的快速击穿测量。 （2016，https://doi.org/10.1038/ncomms10721）并发现在这些事件的 9.5 km 起始高度处，放电区域的平均环境电场至少为 1.0−1.5×105 V/m。该电场接近失控电子雪崩电场和正流光传播的临界场。这些测量为更详细地分析或模拟快速击穿过程中发生的情况提供了一个有意义的起点，该快速击穿过程负责引发至少一些闪电放电。
We report a new approach to measure indirectly the ambient thunderstorm electric fields in fast positive breakdown regions. For a given geometry of the discharged fast breakdown region, we show that there is a minimum ambient electric field required to produce a given charge moment change. We apply this approach to the fast breakdown measurements for two events reported by Rison et al. (2016, https://doi.org/10.1038/ncomms10721) and find that the average ambient electric field in the discharged region is at least 1.0−1.5×105 V/m at the 9.5 km initiation altitude of these events. This electric field is close to the runaway electron avalanche electric field and to the critical field for positive streamer propagation. These measurements provide a meaningful starting point for more detailed analyses or simulations of what occurs inside the fast breakdown process that is responsible for the initiation of at least some lightning discharges.
影响因子：
4.4
作者：
Liu, Ningyu;Dwyer, Joseph R.;Wilson, Jennifer G.
通讯作者：
Wilson, Jennifer G.