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利用无狭缝摄谱技术获取了中国广东一次人工触发闪电通道等离子体的光谱。基于光谱诊断方法确定了该触发闪电通道电流的最大值与最小值分别为30.9和25.6 kA，并采用线性电流衰减传输线模型（Modified Transmission Line with Linear Current Decay，简记为MTLL）对电流进行了模拟。在此基础上，采用时域有限差分方法（Finite-Difference Time-Domain，简记为FDTD）和传输线模型研究了不同距离处的电场分布特征，并对58 m处产生的电场进了比较。结果发现：当回击速度取1.3×108m/s时，辐射电场与实验垂直电场偏差较大，但与FDTD方法模拟的垂直电场符合一致。进一步地，采用FDTD方法、偶极子方法、电荷-磁场极限估算法研究了58 m、90 m、1.6 km的磁场分布。与实验数据比较发现：不同计算方法与实验值在58和90 m处有一定差异，但在1.6 km处符合一致。The channel plasma characteristics of an artificially triggered lightning in Guangdong, China, were analyzed using slit-free spectroscopy technology. Spectral diagnostics were performed to obtain the peak currents by about 30.9 kA (maximum) and 25.6 kA (minimum), which were subsequently simulated using the 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 were employed. At a distance of 58 m, the TL-predicted radiation electric field deviates from experimental electric field when assuming a return stroke velocity of 1.3×108m/s, but becomes close alignment with the FDTD-simulation of vertical electric fields. Moreover, the analysis of magnetic fields at 58 m, 90 m, and 1.6 km were compared using FDTD simulations, Dipole approximations, and Charge Magnetic Field Limit (CMFL) estimations. The discrepancies between calculated and experimental values are appeared at 58 m and 90 m, probably 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.
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Keywords:
- Artificially triggered lightning /
- Spectroscopic diagnostics /
- FDTD method /
- Channel current /
- Electromagnetic field
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