A Model for Ball Lightning Derived from an Extension of the Electrodynamics Equations

Ball lightning is an impressive natural electromagnetic phenomenon occurring in atmosphere under suitable circumstances. Its origin, composition and stability issues are a matter of debate, due to presence of many evidences still unexplained. An attempt to provide a model, in alternative to the ones already available, is here presented. The aim is to interpret the phenomenon through a fluid plasma self-trapped in very stable toroid-shaped regions. To this end, a suitable adaptation of the equations ruling electrodynamics is taken into account.