Model of the First Lightning Return Stroke Using Bidirectional Leader Concept

0565634 - ÚFA 2023 RIV US eng J - Článek v odborném periodiku
Kašpar, Petr - Kolmašová, Ivana - Santolík, Ondřej
Model of the First Lightning Return Stroke Using Bidirectional Leader Concept.
Journal of Geophysical Research-Atmospheres. Roč. 127, č. 24 (2022), č. článku e2022JD037459. ISSN 2169-897X. E-ISSN 2169-8996
Grant CEP: GA ČR GA20-09671S; GA MŠMT EF15_003/0000481
Institucionální podpora: RVO:68378289
Klíčová slova: return stroke * bidirectional leader * model * electromagnetic-fields * breakdown pulses
Obor OECD: Fluids and plasma physics (including surface physics)
Impakt faktor: 4.4, rok: 2022
Způsob publikování: Omezený přístup
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022JD037459

We have developed a new lightning return stroke model which takes into account a realistic charge distribution to compute the ambient electric potential. It contains a nonlinear resistance model for the development of the finite conductivity of the lightning channel. It also describes a redistribution of charges after the bottom end of the channel is attached to the potential of the ground. The model is based on solving Maxwell's equations linked to Poisson's equation, and coupled with Ohm's law. The waveshape of the current at the channel base is obtained from the model. The simulated current decreases and its rise time increases with height, which is in accordance with the luminosity observations. The electric and magnetic field waveforms modeled for different distances from the lightning flash show that most of the waveform features typically observed at these distances are well reproduced. We also successfully compare modeled magnetic field waveforms with measurements at the distances larger than 30 km.
Trvalý link: https://hdl.handle.net/11104/0337157