Abstract
The stability of Alfven waves in magnetized accretion disks is studied. Balbus and Hawley (1991) have recently found that axisymmetric waves are unstable in high-beta disks. It is shown here that nonaxisymmetric (spiral) waves are subject to a similar but physically different instability, present already at low beta. Transient wave packets are amplified at the same time as they are sheared by differential rotation in the disk. This instability appears as a very good candidate to explain turbulent accretion, and also to drive outflows in the magnetosphere of the disk.
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