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, E-ISSN 1879-1824, 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 [mu]s 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 [Omega]/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
Engineering and Technology
IdentifiersURN: urn:nbn:se:uu:diva-113140DOI: 10.1016/j.jastp.2009.06.002ISI: 000268905500021ISBN: 1364-6826OAI: oai:DiVA.org:uu-113140DiVA: diva2:289909