Change search
ReferencesLink to record
Permanent link

Direct link
On the velocity of lightning upward connecting positive leaders
Division for Electricity, Uppsala University.ORCID iD: 0000-0002-6375-6142
2007 (English)In: IX International Symposium onLightning Protection, 2007Conference paper (Refereed)
Abstract [en]

The point of interception of the downward movinglightning leader by a newly created upward connectingleader depends upon the velocity of both leaders. Eventhough measurements and estimates of the velocity ofdownward moving lightning leaders are more common in theliterature, only few values of the velocity of upwardconnecting leaders have been reported. In this paper, a selfconsistentleader propagation model is used to estimate thevelocity of upward connecting positive leaders initiated froma tall tower under the influence of downward negativelightning leaders. It is predicted that an upward connectingleader propagates with low velocity (lower than about 5 x103 m s-1) immediately after the creation of the first leadersegment. It is not until the electric field produced by thedownward leader is high enough for the continuousacceleration of the leader channel, when the upward leadervelocity reaches values close to the ones observed inlaboratory (about 1-2 x 104 m s-1). Then, the connectingleader continues its movement with increasing velocity untilit intercepts the downward moving leader. The propagationof upward connecting leaders has been found to beinfluenced by the prospective return stroke current, theaverage velocity and the lateral position of the downwardleader channel as well as by the ambient field. This resultclearly shows that the velocity and propagation time ofupward connecting positive leaders change from flash toflash and they cannot be generalized by assuming a givenvelocity ratio of both leaders as it is assumed by the existingleader progression models.

Place, publisher, year, edition, pages
, International Symposium on Lightning Protection, 9
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-74187OAI: diva2:489278
IX International Symposium on Lightning Protection. Foz do Iguaçu, Brazil. 26th-30th November 2007
QC 20120523Available from: 2012-02-02 Created: 2012-02-02 Last updated: 2012-05-23Bibliographically approved

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Becerra Garcia, Marley
Electrical Engineering, Electronic Engineering, Information Engineering

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 47 hits
ReferencesLink to record
Permanent link

Direct link