This article presents the electric field waveforms of natural return strokes recorded by Foshan Total Lightning Location System. The distance ranges from 10 to 300 km. The evolution of parameters for positive first and negative first and subsequent return stroke electric field waveforms along with distance change is analyzed. The results show that the risetime, fall time, half-peak width, and zero-crossing time become longer with longer distance, and these four parameters of the negative return strokes show more clear linear relation with distance than the positive return strokes. For the overshoot duration, the values for both positive and negative return strokes increase with distance at 10–200 km, but when the distance is larger, the distance dependence becomes less obvious. The values of the initial peak normalized to 100 km and 20 kA remain the same in general for all the return strokes. For the overshoot amplitude and the ratio of overshoot to initial peak, the values for both positive and negative return strokes increase with distance. The return stroke electric field waveforms at far distances are more likely to show clear opposite polarity overshoot.

中文翻译：

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不同距离自然回程电场参数


本文介绍了佛山总闪电定位系统记录的自然回击电场波形。距离范围为10至300公里。分析了正第一和负第一以及随后的回程电场波形的参数随距离变化的演变。结果表明，上升时间、下降时间、半峰宽和过零时间随着距离的增加而变长，并且负回程的这四个参数与距离的线性关系比正回程的线性关系更清晰。对于超调持续时间，在 10~200 km 范围内，正、负回程值均随距离增加而增加，但当距离较大时，距离依赖性变得不那么明显。对于所有返回行程，标准化为 100 km 和 20 kA 的初始峰值值总体上保持相同。对于过冲幅度以及过冲与初始峰值的比率，正向和负向返回行程的值都随着距离而增加。远距离处的回程电场波形更有可能表现出明显的相反极性过冲。