CV Disks
through outburst
€By following the X-ray and optical brightness of the disk during an outburst (needs coordinated observations) it can be seen that the X-ray brightness lags the optical brightness
€This is because the outburst starts in the middle/outer parts of the disk, then propagates inwards
€This is the result of an instability, or because of increased mass accretion rates from the secondary (Bath/Osaki debate)
Baptista & Catalàn (2000)
Mason et al (1978)