  Noise induced order in excitable systems has diverse manifestations, such as
coherence resonance (CR) and stochastic resonance. In this context a less
explored phenomenon is self-induced stochastic resonance (SISR). Unlike CR,
SISR may arise away from the bifurcation threshold and the properties of the
induced oscillations depend upon both the noise intensity and the time-scale
separation factor. In this work, we report a new chimera pattern in a network
of coupled excitable units, namely the self-induced stochastic resonance
chimera or SISR-chimera that originates from the SISR phenomenon. We explore
the detailed dynamics of the SISR-chimera in the parameter space using proper
quantitative measures. We have found that unlike CR chimera, the SISR-chimera
pattern strongly depends upon the ratio of time scale and noise intensity.
Therefore, this type of chimera pattern can be induced even for a tiny noise
intensity if the time scale separation of the activator and inhibitor is large
enough.
