CATACLYSMIC VARIABLES IN THE ROSAT PSPC ALL-SKY SURVEY

91 cataclysmic variables from a sample of 162 systems with known or su spected binary periods were detected during the ROSAT XRT-PSPC All Sky Survey. Among the non-magnetic systems, the X-ray to optical/ultravio let flux ratio decreases along the sequence SU UMa type - U Gem type - Z Cam type - UX UMa type, due mainly to variations in the optical/ult raviolet flux. 8 of the 10 brightest systems in terms of total PSPC co untrate are magnetic systems. The 0.5-2.5 keV X-ray luminosities range up to similar to 10(32)erg/s, the highest luminosities being those of four faraway DQ Her type systems. The other types of cataclysmic vari ables all have similar 0.5-2.5 keV luminosity distributions. In an App endix we compare the X-ray properties of cataclysmic variables with th ose of the dim X-ray sources in globular clusters.