On the stability of magnetized accretion discs

Details On the stability of magnetized accretion discs On the stability of magnetized accretion discs

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.255p..25k&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 255, April 1, 1992, p. 25P-28P.

Astronomy and Astrophysics

Astronomy

55

Accretion Disks, Magnetic Field Configurations, Magnetohydrodynamic Stability, Rotating Plasmas, Angular Momentum, Eigenvalues, Shear Flow

Scientific paper

The shear instability of differentially rotating magnetized accretion disks is formulated as an eigenvalue problem. A monotonic instability caused by the presence of weak vertical magnetic fields, claimed by Balbus & Hawley (1991) on the basis of a local analysis, is shown to be absent whenever an azimuthal magnetic field is present. Instead the instability may take the form of overstable oscillations. A necessary condition for such an instability is obtained.

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