We have investigated the constructive roles of temporal noise, spatial disorder, and spatiotemporal fluctuation on the formation of spiral waves. Noise-sustained spiral waves are observed, the order of which passes a maximum with the increment of noise intensity, showing spatiotemporal coherent resonance. Moreover, we find that spatiotemporal fluctuation is much more favorable for the ordering process than temporal-noise only or spatial-disorder only. We demonstrate that this phenomenon shows the disadvantageous effect of spatial or temporal memory of noise.
Physical Review Letters
- Pub Date:
- December 2002
- Fluctuation phenomena random processes noise and Brownian motion;
- Nonlinear dynamics and chaos;
- Pattern formation in reactions with diffusion flow and heat transfer