On the electric field at the tip of dart leaders in lightning flashes

Details On the electric field at the tip of dart leaders in lightning flashes On the electric field at the tip of dart leaders in lightning flashes

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jastp..71.1397c&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 71, Issue 12, p. 1397-1404.

Physics

1

Lightning, Energy, Electric Field, Dart Leaders, Electrical Discharges, X-Rays

Scientific paper

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.

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