Physics – Plasma Physics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ppcn.conf..387t&link_type=abstract
In ESA, Fourth International Toki Conference on Plasma Physics and Controlled Nuclear Fusion p 387-390 (SEE N94-22624 05-75)
Physics
Plasma Physics
Accretion Disks, Magnetohydrodynamic Stability, Magnetohydrodynamic Turbulence, Magnetohydrodynamic Waves, Perturbation Theory, Wentzel-Kramer-Brillouin Method, Compression Waves, Computerized Simulation, Stellar Mass Accretion, Wave Propagation
Scientific paper
With the discovery that Alfven waves can be strongly unstable in a magnetized accretion disk, it can be expected to explain the turbulence necessary to drive accretion in these disks. The instability of non-axisymmetric Alfven waves is studied using analytical derivations and numerical simulations. An exact set of equations for the time evolution of the perturbations, giving a simple analytical result in the limit of very low beta, is derived. Using a Wentzel - Kramers - Brillouin approximation, the domain of existence and dominance of the set of modes corresponding to increasing values of n are found. A one dimensional linearized magnetohydrodynamic simulation is used to confirm these results and describe the time evolution of an initial perturbation in the disk. Pressure forces which can however be straightforwardly included are neglected. These forces are found negligible, even at high beta.
Coroniti F. C.
Pellat Rene
Tagger Michel
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