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Initial-stage pulses in upward lightning: Leader/return stroke versus M-component mode of charge transfer to ground
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2008 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 35, no 13, L13812- p.Article in journal (Refereed) Published
Abstract [en]

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 mu s) 10-to-90% risetimes and 26 IS pulses had relatively long (> , 8 mu s) 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.

Place, publisher, year, edition, pages
2008. Vol. 35, no 13, L13812- p.
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Engineering and Technology
URN: urn:nbn:se:uu:diva-109967DOI: 10.1029/2008GL034148ISI: 000257738600004OAI: oai:DiVA.org:uu-109967DiVA: diva2:274905
Available from: 2009-11-02 Created: 2009-11-02 Last updated: 2016-04-13Bibliographically approved

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