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Initial-stage pulses in upward lightning: Leader/return stroke versus M-component mode of charge transfer to ground
University of Florida, Gainesville, USA.
University of Florida, Gainesville, USA.
University of Federal Armed Forces Munich, Neubiberg, Germany.
University of Federal Armed Forces Munich, Neubiberg, Germany.
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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.
National Category
Earth and Related Environmental Sciences Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-62544DOI: 10.1029/2008GL034148ISI: 000257738600004OAI: oai:DiVA.org:kth-62544DiVA: diva2:480926
Note
QC 20120120Available from: 2012-01-20 Created: 2012-01-19 Last updated: 2017-12-08Bibliographically approved

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Thottappillil, Rajeev

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