A comparative study on two interesting preliminary breakdown processes observed in a winter TGF lightning flash

Dataset Description This dataset contains 3D lightning location results for a winter TGF lightning flash. Two files are included: HF3D_1734785454_1.dat – 3D lightning locations for the first initiation. HF3D_1734785454_2.dat – 3D lightning locations for the second initiation. The timestamp 1734785454 corresponds to the occurrence time of the lightning flash in Japan Standard Time (JST). File format and parameters The first row contains the lightning occurrence time. Column descriptions: Time (ms) – time relative to the lightning source. X, Y, Z (m) – 3D spatial coordinates relative to sea level. The origin (0, 0, 0) corresponds to latitude 36.76°N and longitude 136.76°E. This dataset allows analysis of the spatial and temporal development of both the first and second initiation processes of the lightning flash.