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Effect of the space charge layer created by corona at ground level on the inception of upward lightning leaders from tall towers
Division for Electricity, Uppsala University.ORCID iD: 0000-0002-6375-6142
Division for Electricity, Uppsala University.
Laboratoire d’Ae´rologie, UMR CNRS, Universite´ Paul Sabatier, Toulouse, France.
Laboratoire d’Ae´rologie, UMR CNRS, Universite´ Paul Sabatier, Toulouse, France.
2007 (English)In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 112, no 12Article in journal (Refereed) Published
Abstract [en]

Electric field measurements above ground have shown that the space charge layercreated by corona at ground level shields the background electric field produced by thethundercloud. Therefore it is expected that this space charge layer can also influence theconditions required to initiate upward lightning from tall objects. For this reason, anumerical model that describes the evolution of the main electrical parameters below athunderstorm is used to compute the space charge layer development. The time variationof the electric field measured at 600 m above ground during the 1989 rockettriggered lightning experiment at the Kennedy Space Center (Florida) is used to drive themodel. The obtained space charge density profiles are used to compute the conditionsrequired to initiate stable upward lightning positive leaders from tall towers. Corona at thetip of the tower is neglected. It is found that the space charge layer significantly affectsthe critical thundercloud electric fields required to initiate upward lightning leadersfrom tall objects. The neutral aerosol particle concentration is observed to have asignificant influence on the space charge density profiles and the critical thundercloudelectric fields, whereas the corona current density does not considerably affect the resultsfor the cases considered in the analysis. It is found that a lower thundercloud electric fieldis required to trigger a lightning flash from a tall tower or other tall slender groundedstructure in the case of sites with a high neutral aerosol particle concentration, like polluted areas or coastal regions.

Place, publisher, year, edition, pages
2007. Vol. 112, no 12
Keyword [en]
Atmospheric aerosols, Current density, Electric corona, Electric field measurement, Electric space charge, Lightning, Towers
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-72505DOI: 10.1029/2006JD008308ISI: 000247534000003OAI: oai:DiVA.org:kth-72505DiVA: diva2:487703
Note
QC 20120202Available from: 2012-01-31 Created: 2012-01-31 Last updated: 2017-12-08Bibliographically approved

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Becerra Garcia, Marley

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