On the electric field at the tip of dart leaders in lightning flashes
2009 (English)In: Journal of Atmospheric and Solar-Terrestrial Physics, ISSN 1364-6826, Vol. 71, no 12, 1397-1404 p.Article in journal (Refereed) Published
The results obtained in this study show that as the dart leader tip passes a given point on the defunct return stroke channel the electric field increases within a fraction of a microsecond to values larger than the critical electric field necessary for the initiation of cold electron runaway in low-density air comprising the channel. These results are in support of the hypothesis that cold runaway electron breakdown may play a role in the emission of X-ray bursts by dart leaders. The calculations also show that the peak power dissipated by a typical dart leader is about 300–500 MW/m and the energy dissipated within the first 10 μs or so is about 500–600 J/m. Furthermore, the minimum resistance and the maximum radius of the core of a typical dart leader are estimated to be about 3 Ω/m and 0.003 m, respectively.
Place, publisher, year, edition, pages
2009. Vol. 71, no 12, 1397-1404 p.
Lightning, Energy, Electric field, Dart leaders, Electrical discharges, X-rays
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-72423DOI: 10.1016/j.jastp.2009.06.002ISI: 000268905500021OAI: oai:DiVA.org:kth-72423DiVA: diva2:487628
QC 201202092012-01-312012-01-312012-02-09Bibliographically approved