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The X-ray spectrum of Mkn 478 is known to be dominated by a strong softexcess which can be described using relativistic blurred reflection. Usingobservations from {\it XMM-Newton}, {\it AstroSat} and {\it Swift}, we showthat for the long-term ($\sim$ years) and intermediate-term (days to months)variability, the reflection fraction is anti-correlated with the flux andspectral index, which implies that the variability is due to the hard X-rayproducing corona moving closer to and further from the black hole. Usingflux-resolved spectroscopy of the {\it XMM-Newton} data, we show that thereflection fraction has the same behaviour with flux and index on shorttime-scales of hours. The results indicate that both the long-term andshort-term variability of the source is determined by the same physicalmechanism of strong gravitational light bending causing enhanced reflection andlow flux as the corona moves closer to the black hole.

Correlated variability of the reflection fraction with the X-ray flux and spectral index for Mkn 478