Initial-stage pulses in upward lightning: Leader/return stroke versus M-component mode of charge transfer to ground

Details Initial-stage pulses in upward lightning: Leader/return stroke versus M-component mode of charge transfer to ground Initial-stage pulses in upward lightning: Leader/return stroke versus M-component mode of charge transfer to ground

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3513812f&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 13, CiteID L13812

Physics

4

Atmospheric Processes: Lightning, Atmospheric Processes: Atmospheric Electricity, Atmospheric Processes: Land/Atmosphere Interactions (1218, 1631, 1843)

Scientific paper

We analyzed high-speed video images and corresponding current records for eight upward lightning flashes initiated by the Peissenberg tower (160 m) in Germany. These flashes contained a total of 33 measurable initial stage (IS) current pulses, which are superimposed on steady IS currents. Seven IS pulses had relatively short (<8 μs) 10-to-90% risetimes and 26 IS pulses had relatively long (>8 μs) risetimes. Six (86%) of seven IS current pulses with shorter risetimes each developed in a newly-illuminated branch, and 25 (96%) of 26 IS pulses with longer risetimes occurred in already luminous (current-carrying) channels. These results support the hypothesis that longer risetimes are indicative of the M-component mode of charge transfer to ground, while shorter risetimes are associated with the leader/return stroke mode. Similar results were obtained for M-component pulses that are superimposed on continuing currents following return-stroke pulses.

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