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We have analysed 16 observations of class beta of GRS 1915+105 performed withthe Rossi X-ray Timing Explorer. We show the time-resolved evolution (every 16seconds) of the X-ray spectral parameters during these observations. The threemodel independent states (A, B, C) identified in the color-color diagrams aredescribed here in terms of the more physical (and model dependent) quantitiesof the disc and power law components. As in the color analysis, we observespecific and time-asymmetric transitions between states. Within a singleobservation, we identified a loop-like cycle of the power law spectral indexthat starts and ends with the ending of state C. There is evidence of localmass accretion rate variations and mass loss during the long instabilityintervals (long state C). This is consistent with simultaneous radio and X-rayobservations that show a one-to-one relation between the long state C and theradio flares, that occur shortly after it: a loss of disc mass is followed byan ejection of matter in the jet.

Evidence for local mass accretion rate variations in the disc of GRS 1915+105