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Processes of electric characteristics vertical profiles formation in atmospheric surface layer are analyzed on the basis of measurements results of summer expeditions performed both in the recent years (2012 - 2017) and during earlier periods, mainly at the territory of the Don steppes. The most important among approaches, on which the performed research is based, is the complex character of measurements. The most significant parameters for electric processes in the atmospheric surface layer are monitored alongside with the atmospheric electrical characteristics. The paper discusses formation mechanisms of the observed types of atmospheric electrical conductivity profiles with consideration of radon-222 volumetric activity and mixing processes in the surface layer.