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Volume 25 No.1 May 2014
Cloud-to-air negative leaders of intracloud flashes allow for the photographic imaging of weakly luminous streamer phenomena, as there is no return stroke producing bright light emissions and causing image saturation. Also, such leaders can propagate well out of the cloud, contrasting with a dark sky background. This photograph from a study by Edens et al. (Geophys. Res. Lett. 41, 2014) shows a negative leader that emerged from the cloud and propagated upward to 10.3 km altitude before terminating. Streamers constituting corona brushes are resolved along the leader channel, as well as an unconnected space leader with attached streamers that shows the leader step formation in progress.
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