Mixed mode of charge transfer to ground for initial continuous current pulses in upward lightning
2011 (English)In: 2011 7th Asia-Pacific International Conference on Lightning (APL), 2011, 677-681 p.Conference paper (Refereed)
In this paper, we discuss properties of initial continuous current (ICC) pulses superimposed on the slow varying initial stage current in upward flashes initiated from the Gaisberg Tower (GBT) based on simultaneous current, near/far electric field measurements. ICC pulses are usually associated with M-component mode of charge transfer to ground, if only one branch of the lightning channel is active. However, there are several cases in which ICC pulses involve a predominantly leader/return-stroke mode of charge transfer to ground in a new channel that connects to the old channel carrying continuous current. With the help of high-speed video camera records, we find that this mixed mode of charge transfer for ICC pulses, leader-return stroke in one channel and continuous current in another channel, occurring simultaneously during the initial stage current in upward lightning from tall towers is very common. This is in contrast to triggered-lightning where usually only one channel is dominant and ICC pulses are associated predominantly with M-component mode of charge transfer. Also, ICC pulses with mixed-mode of charge transfer have shorter risetimes, larger peaks, and shorter half-peak widths.
Place, publisher, year, edition, pages
2011. 677-681 p.
ICC pulse;M-component mode;charge transfer mixed mode;high-speed video camera record;initial continuous current pulse;leader-return-stroke mode;lightning channel;near-far electric field measurement;shorter half-peak width;simultaneous current based Gaisberg tower;slow varying initial stage current;upward lightning;charge exchange;earthing;electric field measurement;lightning protection;video cameras;
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-82367DOI: 10.1109/APL.2011.6110212ScopusID: 2-s2.0-84862967946OAI: oai:DiVA.org:kth-82367DiVA: diva2:498185
2011 7th Asia-Pacific International Conference on Lightning, November 1-4, 2011, Chengdu, China
QC 201202142012-02-112012-02-112013-01-09Bibliographically approved