Abstract
AbstractThe physical processes of leader in one triggered lightning flash using the altitude‐triggering technique are studied. The main characteristics involved in the triggered lightning are inferred from data of simultaneous electric field change measurements at two stations and highly time‐resolved optical signals. The results reveal the characteristics of leader propagation in triggered lightning. When rocket attached thin steel wire is ascending to the height of several hundred meters, a bi‐directional leader is initiated at top and bottom end of the wire. When the negative leader propagating downward approaches to the ground, a positive connecting leader is initiated from the ground and propagates upwardly. The mean speed of the negative and connecting positive leader is around 0.86×105 m/s. A mini‐return stroke is produced with the connection to the ground of the downward negative leader. The upward positive leader initiated from the top end of wire propagates at a speed of about 1.1×105 m/s.
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