Self-organization and $1/f$ noise in granular superconductors

The interplay between the widespread phenomena such as $1/f$ noise and self-organization of the critical state is studied both theoretically and by computer simulation using a model of multijunction SQUID exposed to an external magnetic field. It is demonstrated that the spectra of the average current in the systems of different size exhibit a broad region of $1/f$ noise limited only by the system size. However, the coexistence of $1/f$ noise and self-organization of the critical state was observed only in one two-dimensional system.