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Book chapter

Electrical Structure Of The Unipolar Charged Aerosol Cloud

Davydenko S., Iudin D., Klimashov V., Kostinskiy A., Syssoev V. S.
The artificial charged aerosol cloud is used as a hand-operated source of the spark  discharges similar to the thunderstorm lightning discharges. Based on the assumption that the intracloud  space charge density could be presented as a superposition of the regular and irregular parts, a model of  the electrical structure of the charged aerosol cloud is developed. The regular part of the charge density  distribution is calculated in the steady-state current approximation taking into account the source current  structure and disturbance of the electric conductivity in the vicinity of the cloud. The irregular part of the  distribution describes random spatiotemporal fluctuations of the charge density. It is shown that a  quasi-electrostatic field provided by the charged aerosol is characterized by significant spatial fluctuations  showing the scale invariance. The mean-square fluctuations of the voltage between the different parts of  the cloud are proportional to the square root of its linear dimensions and may reach significant values even  in the absence of the regular field. The fluctuation intensity is proportional to the aerosol density and to the  squared characteristic absolute value of the charge of the aerosol particles. The basic parameters of the  extremely fluctuating spatial structure of the electric field inside the considered unipolar charged aerosol  cloud are estimated. It is shown that the fluctuations of the electric field lead to the drop of the dielectric  strength of the air and could serve as one of the important mechanism of the lightning initiation.