http://arxiv.org/abs/1409.8200
We analyze the linear stability of an axially symmetric ideal plasma disk, embedded in a magnetic field and endowed with a differential rotation. This study is performed by adopting the magnetic flux surface function as the fundamental dynamical variable, in order to outline the role played by the co-rotation theorem, in the background configuration. The present formulation shows the existence of a magnetic threshold for the emergence of a Magneto-rotational instability. In the Keplerian case, triggering unstable modes requires the magnetic field forms an angle greater than 30 degree with the equatorial plane.
G. Montani and D. Pugliese
Tue, 30 Sep 14
1/81
Comments: 5 pages
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