| Abstract: | An attempt has been made to describe analytically the electrodynamics of a convective cloud on the basis of a one-dimensional
convective cell with solid gas rotation. The cloud electrification is due to the interaction between heavy (large raindrops
and particles of hail) and light (microparticles of water and ice) particles. As a result, the particles acquire unlike electric
charges. The large-scale electric field in the cloud is stipulated by boundary effects and influences considerably the motion
of the heavy fraction of aerosol particles. A scenario is proposed for the development of an intracloud charge, by which the
large-scale electric field does not reach the breakdown value, staying at the level of the corona discharge field, while an
increase in the irregular component of the electric field is continued and achieves the breakdown value in the small-scale
electric cells induced by analogues of plasma beam instabilities. The basic electric discharge occurs against the background
of multiple discharges inside the cell which provide for the leader lightning channel.
Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii,
Radiofizika, Vol. 40, Nos. 1–2, pp. 123–137, January–February, 1997. |
