High-time-resolved mapping results of two rare reactivation processes following a negative return stroke are discovered and analyzed. At first, the discharges prior to the reactivation process were dominated by positive discharges lasting for tens of milliseconds in a limited space in the vicinity of a decayed negative leader channel. The positive discharges produced no detectable electric field change. Then, negative discharges started and propagated along the decayed downward negative leader channels at a speed exceeding 10⁶ m/s for a few microseconds and produced negative electric field changes. The analysis reveals that the processes are physically distinct from recoil leaders and side discharges in terms of propagation behaviors, electromagnetic characteristics, and time scale. The possible mechanisms of the processes are discussed. The observation suggests that the reactivation processes of the negative leaders may lead to subsequent return strokes.

中文翻译：

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雷电放电中负回程后负导引再激活过程的观察证据


发现并分析了负回程后两个罕见的再激活过程的高时间分辨标测结果。起初，再激活过程之前的放电主要是在衰减的负导通道附近的有限空间内持续数十毫秒的正放电。正放电没有产生可检测的电场变化。然后，负放电开始并以超过 10⁶ m/s 的速度沿着衰减的向下负导流道传播几微秒，并产生负电场变化。分析表明，这些过程在传播行为、电磁特性和时间尺度方面与反冲引线和侧向放电在物理上是不同的。讨论了这些过程的可能机制。观察结果表明，消极领导者的重新激活过程可能导致随后的回击。