  We investigated the temporal behavior of the new black hole transient XTE
J1650-500 with the Rossi X-ray Timing Explorer (RXTE) as the source made a
transition to the low/hard state during the decay of the 2001 outburst. We find
QPOs in the 4 - 9 Hz range, enhanced time lags and reduced coherence during the
state transition. We also observe a shift in the peak frequency of the noise
component with energy during the transition. The evolution of the power
spectrum as well as the lag and coherence behavior during the state transition
are similar to the state transitions observed for other black hole sources,
especially Cyg X-1. The temporal properties during the transition to the low
state put constraints on the accretion geometry of XTE J1650-500 and may have
implications for all black hole binary systems. We suggest a possible geometry
and evolution of a jet+corona+disk system based on enhanced lags and peak
frequency shift during the transition.
