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Passive radio engineering monitoring means of storm activity in VLF range are considered in the work. The comparative analysis of characteristics of modern Russian and foreign lightning location systems which have a broad practical application is carried out. Possibilities of improvement of precision and probabilistic characteristics of VLF methods and techniques for location of various types of lightning high current components are estimated.

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A simplified dipole version for an "engineering" return stroke model is considered. The quantitative estimations of its applicability and possible ways of equivalent dipole moment (or its derivatives) reconstruction are discussed. The model is supplemented with clustered sets of sferic wave forms in very low frequency (VLF) band (0,3 ... 30 kHz). Being registered in hard distance constraints these wave forms can be considered as second derivatives of dipole moments. Their averaged wave forms given as tables or approximations can be used for routine numerical field calculations in different applications.