A rocket‐triggered lightning flash containing negative‐positive‐negative current polarity reversal during its initial stage is analyzed using multiple synchronized observation data. The flash was triggered under a thunderstorm transition zone between the convective region and the stratiform region. The upward positive leader branched and developed toward the stratiform region. When the negative initial continuous current was decreasing, a negative stepped leader was transformed from a recoil leader on a preexisting positive branch. As the negative leader developed toward the convective region, a breakdown process initiated on a preexisting positive channel and propagated toward the back end of the negative stepped leader, accompanied with a positive electric field change pulse. The current polarity changed from negative to positive about 0.22 ms after the onset of the breakdown process. The negative leader terminated after propagating for 71.08 ms, while scattered discharges on other positive branches maintained to develop, and then the ICC polarity changed from positive to negative.

中文翻译：

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火箭触发的闪电，在其初始阶段包含负-正-负电流极性反转

使用多个同步观测数据分析火箭在初始阶段包含负-正-负电流极性反转的闪电。在对流区和层状区之间的雷暴过渡带下触发了闪电。积极向上的领导者分支并向层状区域发展。当负的初始连续电流减小时，负的阶跃引导器将从先前存在的正极分支上的反冲引导器转变而来。随着负极引线向对流区域发展，击穿过程在预先存在的正极通道上开始，并向负极阶梯引线的后端传播，同时伴随着正电场变化脉冲。电流极性从负变为正，大约为0。故障过程开始后的22 ms。负引导物在传播71.08 ms之后终止，而其他正分支上的分散放电则继续发展，然后ICC极性从正变为负。