Observations of corona in triggered dart‐stepped leaders
作者： W. R. Gamerota , M. A. Uman , J. D. Hill , D. M. Jordan
DOI: 10.1002/2014GL062911
关键词:
摘要: Corona streamers are a critical component of lightning leader step formation and postulated to produce the very high electric fields at their tips that runaway electrons resulting in observed X-ray bursts associated with stepping. emanating from vicinity tip between steps was analyzed using three sequential high-speed video sequences dart-stepped leaders different triggered flashes during summers 2013 2014 northeast Florida. Images were recorded 648 kiloframes per second (1.16 µs exposure time, 380 ns dead time) an altitude 65 m or less. In each image sequence, propagates downward consecutive frames, corona fan outward bright less than frame time about 1.5 µs. 21 exposures, propagate, on average, 9 m below tip.
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