Stochastic resonance and 1/f noise at coupled phase transitions

To a random process with a 1/f power spectrum corresponds the maximum Gibbs-Shannon informational entropy. At stochastic resonance the informational entropy is minimum. A new behavior of a two-dimensional system at stochastic resonance has been revealed: at low frequencies of a periodic action with an increased white noise intensity the system trajectories are limited by two mutually perpendicular directions-anisotropic stochastic resonance. With a further increase in the white noise intensity in the system one can observe “ordinary” stochastic resonance, when the increasing intensity of fluctuations in the vicinity of the driving frequency is smeared in the directions.