Physics
Scientific paper
Jun 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007phpl...14f2107n&link_type=abstract
Physics of Plasmas, Volume 14, Issue 6, pp. 062107-062107-7 (2007).
Physics
8
Macroinstabilities, Magnetohydrodynamics, Plasma Kinetic Equations, Transport Properties, Magnetized Plasmas, Magnetohydrodynamics And Plasmas, Accretion And Accretion Disks
Scientific paper
New instabilities in multicomponent cold magnetized accretion disks are found using not the magnetohydrodynamics (MHD) framework but the equations of motion and continuity for each disk component and Maxwell's equations, where the magnetic field perturbations are substituted by the electric field perturbations. The stationary velocities of magnetized charged particles are taken to be not the Keplerian velocity, as it is adopted in the astrophysical literature using the MHD approach for studying disks, but as the electric and gravitational drifts in the external magnetic field (at the neglect of collisions). The compressibility is taken into account. There are considered axisymmetric as well as nonaxisymmetric perturbations in the form of columns and spokes. The growth rates of instabilities being found can be considerably larger than the growth rate of the well-known magnetorotational instability studied in the MHD framework.
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