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Temporal and spectral variations of black hole candidates during outburstshave been reported in several publications. It is well known that during anoutburst, source becomes softer in first few days, and then returns to hardstates after a few weeks or months. In the present paper, we show variation ofComptonization Efficiency (CE), defined to be the ratio of number of power-lawphotons and number of soft photons injected to into the Compton cloud, as afunction of time in several outbursts. Since power-law photons are generatedthrough inverse-Comptonization of the intercepted soft photons, CE is a measureof geometry of Compton cloud. Our investigation indicates that all outburstsstart with a large CE and becomes very small after a few days, when the Comptoncloud becomes small enough to intercept any significant number of soft photons.CE returns back to a larger value at the end of outburst. We show co-variationof count rates, frequency of quasi-periodic oscillations (QPOs), photon indexand CE and establish a general trend of disk geometry variation duringoutbursts in all systems under consideration.a

A Study of the Variation of Geometry of Accretion Flows of Compact Objects through Timing and Spectral Analysis of Their Outbursts