Previous studies have shown that subsequent leaders in positive cloud-to-ground lightning (+CG) flashes rarely traverse pre-existing channels to ground. In this paper, we present evidence that this actually can be common, at least for some thunderstorms. Observations of +CG flashes in a supercell storm in Argentina by Córdoba Argentina Marx Meter Array (CAMMA) are presented, in which 54 (64%) of 84 multiple-stroke +CG flashes had subsequent leaders following a pre-existing channel to ground. These subsequent positive leaders are found to behave similarly to their negative counterparts, including propagation speeds along pre-existing channels with a median of 8 × 10⁶ m/s, which is comparable to that of negative dart leaders. Two representative multiple-stroke +CG flashes are presented and discussed in detail. The observations reported herein call for an update to the traditional explanation of the disparity between positive and negative lightning.

中文翻译：

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由超级单体产生的正闪电沿同一通道多次击穿接地

先前的研究表明，正云对地闪电 (+CG) 闪电的后续先导很少穿过预先存在的通道到达地面。在本文中，我们提供的证据表明这实际上可能很常见，至少对于某些雷暴而言。Córdoba Argentina Marx Meter Array (CAMMA) 对阿根廷超级单体风暴中的 +CG 闪光进行了观测，其中 84 次多冲程 +CG 闪光中有 54 次（64%）在预先存在的地面通道之后具有后续先导。发现这些随后的正面领导者的行为与他们的负面领导者相似，包括沿预先存在的通道的传播速度，中位数为 8 × 10 ⁶ m/s，可与负飞镖领先者相媲美。详细介绍和讨论了两个具有代表性的多冲程 +CG 闪光。本文报告的观察结果要求更新正负闪电之间差异的传统解释。