Abstract
A theoretical model of Ball lightning (BL) is presented. According to this model the BL is an aggregate of polymer molecules. These macromolecules are interknitted or sewn together, and therefore the structure is a polymer net with the corresponding rheologic and fractal properties. Because of the dielectric properties such BL can accumulate and store large amounts of the electrostatic energy discharges of thunderstorms. The theory gives a reasonable agreement with observational values of the formation time, stored energy and the life time. It also explains some rheological BL properties, form and the appearance from "nowhere".
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