Current Problems of Electrodynamics of a Thunderstorm Cloud |
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Authors: | V Yu Trakhtengerts D I Iudin |
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Institution: | (1) Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, Russia |
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Abstract: | Electrodynamics of a thunderstorm cloud is considered with allowance for recirculation and multiflow motion of charged intracloud
particles. In this simulation, the large-scale electric-field emerges due to the charge separation at the process of air convection
and develops through the oscillation regime in the initial and final stages of the thunderstorm evolution. These oscillations
qualitatively explain the observed behavior of the electric field of a thunderstorm. On the other hand, the multiflow convection
is unstable and leads to generation of small-scale electrostatic waves (wavelength from 1 to 100 m) with amplitude reaching
the conventional breakdown value. Such an instability can initiate microdischarge intracloud activity at the preliminary stage
of the lightning discharge and between individual return strokes. We propose a three-dimensional cellular automata model which
describes the main features of the preliminary stage of the lightning.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 48, No. 9, pp. 810–822, September 2005. |
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