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Ringed accretion disks (RADs) are aggregates of corotating andcounterrotating toroidal accretion disks orbiting a central Kerr super-massiveBlack Hole (SMBH) in AGNs. The dimensionless spin of the central BH and thefluids relative rotation are proved to strongly affect the RAD dynamics. Thereis evidence of a strict correlation between SMBH spin, fluid rotation andmagnetic fields in RADs formation and evolution. Recently, the model wasextended to consider RADs constituted by several magnetized accretion tori andthe effects of a toroidal magnetic field in RAD dynamics have beeninvestigated. The analysis poses constraints on tori formation and emergence ofRADs instabilities in the phases of accretion onto the central attractor andtori collision emergence. Magnetic fields and fluids rotation are proved to bestrongly constrained and influence tori formation and evolution in RADs, independence on the toroidal magnetic fields parameters. Eventually, the RADframe investigation constraints specific classes of tori that could be observedaround some specific SMBHs identified by their dimensionless spin

Multi-accretion events from corotating and counterrotating SMBHs tori