Internal signal stochastic resonance in a modified flow oregonator model driven by colored noise

In the majority of studies on stochastic resonance,white noise without any time correlation has been used. In this paper, a modified Oregonator-type m odel, which was proposed to account for the photosensitivity of the R-u(bpy )(3)(2+) catalyzed Belousov-Zhabotinsky reaction in a flow system, is inves tigated when the control parameter, light flux, is modulated by colored noi se near a Hopf bifurcation point. Noise induced coherent oscillations (NICO ) are observed, and the signal-to-noise ratio (SNR) goes through a maximum with the increment of noise intensity indicating occurrence of internal sig nal stochastic resonance (ISSR). In addition, the SNR also shows resonance behavior with the variation of correlation time of colored noise. The aspec ts of the ISSR in this system are discussed.