人工触发闪电放电过程分析：I.先导放电过程

利用人工触发闪电电场，电流和闪电通道亮度高速摄像观测资料，分析了第一次回击前衔导过程的放电特性，结果指出，对于空中触发，先导传输具有“双向”特征，由于下行先导发展，先导通道电流分布具有不均匀性，连接导线汽化都发生在上行先导阶段。人工闪电第一次回击虽然与自然闪电继后回击特性十分相似，但两者放电特征仍有差别，前者具有曾长的连续电流过程。

THE ANALYSIS OF THE DISCHARGING PROCESSES OF TRIGGERED LIGHTNING FLASHES I. LEADER PROCESSES

In this paper, the characteristics of leader discharge of arlificially triggered lightning flashes were analysed by use of eletrical field, current data, and digital photographic obtained with a high-speed CCD camera system (frame rate 1 000F/s). The results show that a bi-directional leader process initiated from both ends of altitude wire was observed for the so-called altitude-triggering. Because the development of the downward moving leader the channel electric current was non-uniformity. The metal channel-vaporized develop during the upward moving leader. The first return stroke of the artificially triggered lightning flashes are much the same as the subsequent return stroke of the natural lightning, but the both the discharge characteristic have some difference and the former was longer time of the continuous current process.