物理学报2025，Vol.74Issue(14)：73-82,10.DOI:10.7498/aps.74.20250448
基于光谱诊断和时域有限差分方法计算触发闪电电流与电磁场
Calculation of triggered lightning current and electromagnetic fields based on spectral diagnosis and finite-difference time-domain method
摘要
Abstract
The channel plasma characteristics of an artificially triggered lightning in Guangdong,China,are analyzed using slit-free spectroscopy technology.Based on spectral diagnostic methods,the maximum and minimum values of the triggered lightning channel current are determined to be about 30.9 kA and 25.6 kA(minimum),respectively,and the current is simulated using a modified transmission line model with linear current decay(MTLL).To investigate the electric field distribution,the finite-difference time-domain(FDTD)method and transmission line(TL)model are employed.At a distance of 58 m,assuming a return stroke velocity of 1.3 × 108 m/s,the TL-predicted radiation electric field deviates from experimental electric field,but is very close to the FDTD-simulation of the vertical electric field.Moreover,the analyses of magnetic fields at 58 m,90 m,and 1.6 km are compared using FDTD simulations,dipole approximation,and charge magnetic field limit(CMFL)estimation.The discrepancies between calculated value and experimental values appear at 58 m and 90 m,which may be due to the near-field interference and measurement limitation.However,they become small at 1.6 km.This work is helpful for the study of lightning electromagnetic field properties and spectral diagnosis.关键词
人工触发闪电/光谱诊断/时域有限差分方法/通道电流/电磁场Key words
artificially triggered lightning/spectroscopic diagnostics/finite-difference time-domain(FDTD)method/channel current/electromagnetic field引用本文复制引用
索煜航,申晓志,齐奇,张华明..基于光谱诊断和时域有限差分方法计算触发闪电电流与电磁场[J].物理学报,2025,74(14):73-82,10.基金项目
中国气象局雷电重点实验室开放课题(批准号:2024KELL-B012,2022LASWB21)和山西省气象局五台山云物理基地闪电观测研究项目(批准号:SXKZDDW20217103)资助的课题. Project supported by the Open Research Program of Key Laboratory of Lightning Protection,China Meteorological Administration(Grant Nos.2024KELL-B012,2022LASWB21)and the Lightning Observation Research Project of Wutai Mountain Cloud Physics Base,Shanxi Meteorological Bureau,China(Grant No.SXKZDDW20217103). （批准号:2024KELL-B012,2022LASWB21）
