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The torus concept as an essential structural component of active galacticnuclei (AGN) is generally accepted. Here, the situation is discussed when thetorus "twisting" by the radiation or wind transforms it into a dipole toroidalvortex which in turn can be a source of matter replenishing the accretion disk.Thus emerging instability which can be responsible for quasar radiation flaresaccompanied by matter outbursts is also discussed. The "Matreshka" scheme foran obscuring vortex torus structure capable of explaining the AGN variabilityand evolution is proposed. The model parameters estimated numerically for theluminosity close to the Eddington limit agree well with the observations.

A Dipole Vortex Model of Obscuring Tori in Active Galaxy Nuclei