A model of preliminary breakdown pulse peak currents and their relation to the observed electric-field pulses

0467892 - ÚFA 2018 RIV US eng J - Journal Article
Kašpar, Petr - Santolík, Ondřej - Kolmašová, Ivana - Farges, T.
A model of preliminary breakdown pulse peak currents and their relation to the observed electric-field pulses.
Geophysical Research Letters. Roč. 44, č. 1 (2017), s. 596-603. ISSN 0094-8276. E-ISSN 1944-8007
R&D Projects: GA ČR(CZ) GA14-31899S
Grant - others:AV ČR(CZ) AP1401
Program: Akademická prémie - Praemium Academiae
Institutional support: RVO:68378289
Keywords : lightning initiation * electromagnetic radiation * preliminary breakdown pulses
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 4.339, year: 2017
http://onlinelibrary.wiley.com/doi/10.1002/2016GL071483/pdf

Preliminary breakdown pulses (PBPs) occur in the initial phase of lightning. A realistic model for their description is employed to investigate relation between PBP peak currents and PBP electric field amplitudes, and their relation to the return stroke (RS) peak currents. We demonstrate that the PBP peak currents can reach 200 kA, and can be comparable or higher than the corresponding RS peak currents. For a typical PBP electric field waveform PBP peak currents are approximately proportional to the electric field amplitudes. We show that the PBP bipolar overshoot depends primarily on the characteristic time of the line conductivity increase. The magnitude of the charge centers is demonstrated to be very large in order to model the observed PBPs with amplitudes up to 32 V/m at 100 km. Such energetic current pulses might be capable to produce elves or terrestrial gamma-ray flashes.
Permanent Link: http://hdl.handle.net/11104/0265884