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Different modes of charge transfer to ground in upward lightning observed at the Peissenberg tower
Federal Armed Forces Research University, Munich, Germany.
University of Florida, Gainesville, USA.
Federal Armed Forces Research University, Munich, Germany.
Federal Armed Foprces Research University, Munich, Germany.
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2009 (English)Conference paper (Other academic)
Abstract [en]

We analyzed high-speed video images andcorresponding current records for eight upward lightningflashes initiated by the Peissenberg tower (160 m) inGermany. These flashes contained a total of 33 measurableinitial stage (IS) current pulses, which are superimposed onsteady IS currents. Seven IS pulses had relatively short (< 8μs) 10-to-90% risetimes and 26 IS pulses had relatively long(> 8 μs) risetimes. Six (86%) of seven IS current pulses withshorter risetimes each developed in a newly-illuminatedbranch, and 25 (96%) of 26 IS pulses with longer risetimesoccurred in already luminous (current-carrying) channels.These results support the hypothesis that longer risetimesare indicative of the M-component mode of charge transferto ground, while shorter risetimes are associated with theleader/return stroke mode. Similar results were obtained forM-component pulses that are superimposed on continuingcurrents following return-stroke pulses.

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Engineering and Technology
URN: urn:nbn:se:kth:diva-87557OAI: diva2:501763
The X International Symposium on Lightning Protection (SIPDA). Curitiba, Brazil. 9th-13th November 2009
QC 20120427Available from: 2012-02-14 Created: 2012-02-14 Last updated: 2012-04-27Bibliographically approved

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Thottappillil, Rajeev
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