The effects of magnetic field and viscosity on the pulsational instability of thin isothermal accretion disks

Details The effects of magnetic field and viscosity on the pulsational instability of thin isothermal accretion disks The effects of magnetic field and viscosity on the pulsational instability of thin isothermal accretion disks

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996cha%26a..20..259w&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 20, Issue 3, p. 259-266.

Astronomy and Astrophysics

Astrophysics

Scientific paper

Using MHD perturbation, we derive the dispersion equation for pulsational instability of thin isothermal accretion disks. The effects of magnetic field, radial viscous force and the causality-modified α-viscosity are examined. We find that magnetic field is a global destabilizing factor acting on the viscous mode and the two acoustic modes. Radial viscous force is a global stabilizing factor for the two acoustic modes. The causality-modified α-viscosity acts mainly in the inner disk: it is a stabilizing factor for the viscous mode and I-mode when there is no magnetic field, and is a destabilizing factor for the two acoustic modes when there is a magnetic field.

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