  We present results from a 20 ksec RXTE observation of the black hole
candidate Cyg X-1. We apply self-consistent accretion disk corona models to
these hard state data and show that Comptonization in a spherical corona
irradiated by soft photons from an exterior cold disk is able to successfully
model the spectrum. We also present the power spectrum, the coherence function,
and the time lags for lightcurves from four energy bands. By modeling the
high-resolution lightcurves with stochastic linear state space models, we show
that the rapid hard state variability of Cyg X-1 can be explained with a single
timescale.
