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We examine stochastic variability in the dynamics of X-ray emission from theblack hole system GRS 1915+105, a strongly variable microquasar commonly usedfor studying relativistic jets and the physics of black hole accretion. Theanalysis of sample observations for 13 different states in both soft (low) andhard (high) energy bands is performed by flicker-noise spectroscopy (FNS), aphenomenological time series analysis method operating on structure functionsand power spectrum estimates. We find the values of FNS parameters, includingthe Hurst exponent, flicker-noise parameter, and characteristic time scales,for each observation based on multiple 2,500-second continuous data segments.We identify four modes of stochastic variability driven by dissipativeprocesses that may be related to viscosity fluctuations in the accretion diskaround the black hole: random (RN), power-law (1F), one-scale (1S), andtwo-scale (2S). The variability modes are generally the same in soft and hardenergy bands of the same observation. We discuss the potential for future FNSstudies of accreting black holes.

Stochastic variability in X-ray emission from the black hole binary GRS 1915+105