The first detailed video images were recorded in 2006 by Steven Cummer of Duke University, Durham. His images showed that sprites are composed of falling columns of electrical discharge called streamers. In 2007, Hans Stenbaek-Nielsen, of the University of Alaska at Fairbanks used a more senstive camera capable of recording 10,000 frames a second. These new images showed that streamers are drawn by very bright dots, called streamer heads, which travel at 30,000 km/h.
Related category ATMOSPHERIC PHENOMENA AND STRUCTURES
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