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Long negative sparks have been widely used to investigate the lightning attachment process of grounded structures. The rod-to-rod air gap is one of the most common configurations used in laboratory experiments to investigate the characteristics of the positive upward leader in response to the negative descending leader steps. In the research presented in this paper, experimental observations have...
A novel observation method is proposed to study the streamer-leader propagation processes of long air-gap positive discharges. Experiments of 3-12 m air-gap discharges have been conducted in this paper. The observed images could clearly and particularly describe the characteristics of the positive streamer-leader propagation processes. Some important phenomena of the propagation processes are indicated...
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