Reflection and noise in the low spectral state of GX 339-4

We analyze RXTE/PCA observations of GX 339-4 in the low spectral state from 1996-1997 and show that the pattern of its spectral and temporal variabili ty is nearly identical to that of Cyg X-1. In particular, a tight correlati on exists between the QPO centroid frequency and the spectral parameters. A n increase of the QPO centroid frequency is accompanied with an increase of the amplitude of the reflected component and a steepening the slope of the underlying power law. Fourier frequency resolved spectral analysis showed, that the variability of the reflected component at frequencies higher than similar to 1-10 Hz is suppressed in comparison with that of the primary em ission.