Simulation of the channel current and radiated electric field for artificially triggered lightning

作者：Xiaozhi Shen, Xu Yao, Mingyuan Liu, Huaming Zhang, Huaying Wang · 发表于：Journal of the Optical Society of America B · 年份：2025 · DOI：10.1364/josab.547727 · 被引用次数：5 · 研究领域：Lightning and Electromagnetic Phenomena、High voltage insulation and dielectric phenomena、Power Line Communications and Noise

Spectrographic analysis was performed to determine the plasma composition of artificially triggered lightning in Guangzhou, China, by about N I, N II, O I, O II, and Fe II. Different engineering models were adopted to simulate the channel current ( i ) of triggered lightning, the changing rate of current over time ( d i d t ), as well as the changing rate of current over time and height [ d i d ( t ⋅ H )]. It is indicated that the modified transmission line model with linear current decay with height (MTLL) can simulate a moderate channel current. The experimental current is found to be stronger than the simulation at the bottom of the channel, and it is predicted that the addition of iron ions affects the channel current. Furthermore, based on a finite-difference time-domain simulation, the radiated electric field of the return stroke of triggered lightning is found more varied than that of natural lightning. This forms a phenomenon of an overshoot amplitude electric field in triggered lightning. It is predicted that the addition of iron ions in the channel current affects the distribution of the radiated electric field.