Crynodeb
A new ideal magnetohydrodynamic instability is presented. It is shown that linear incompressible Alfvénic disturbances can get over-reflected and exponentially amplified in compressible plasma flows. A simple and transparent stability criterion for a two-layer model is derived. The instability does not require a shear in the flow and may arise for rather moderate sub-Alfvénic flow speeds. It is therefore important to be aware of the Alfvén instability when dealing with laboratory or astrophysical plasma flows.
Iaith wreiddiol | Saesneg |
---|---|
Rhif yr erthygl | 245001 |
Nifer y tudalennau | 4 |
Cyfnodolyn | Physical Review Letters |
Cyfrol | 101 |
Rhif cyhoeddi | 24 |
Dynodwyr Gwrthrych Digidol (DOIs) | |
Statws | Cyhoeddwyd - 08 Rhag 2008 |