  We analyzed 139 chi-state observations of GRS 1915+105 with RXTE from 1997 to
2000 and found i) that the observations fall into two groups with different
Comptonization behavior, ii) that the slope of the hard X-ray component
correlates with the radio flux, thus revealing the interaction of jet and
corona, and iii) a 590 days long term periodicity in the hard X-ray and radio
components.
