The Axisymmetric Instability in Weakly Magnetized Accretion Discs

Details The Axisymmetric Instability in Weakly Magnetized Accretion Discs The Axisymmetric Instability in Weakly Magnetized Accretion Discs

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.266..379k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 266, NO. 2/JAN15, P. 379, 1994

Astronomy and Astrophysics

Astronomy

22

Accretion, Accretion Discs - Instabilities - Mhd Bibliographic Code: 1994Mnras.266..379K

Scientific paper

The energy principle is used to find the global criteria for stability to axisymmetric perturbations of stationary, magnetized, differentially rotating flows, in particular accretion discs. It is found that the vertical fields usually tend to stabilize while the toroidal fields destabilize, except when the vertical fields are weak. Bounds are placed on the growth rates of the instability. Normal modes are computed for fields in slender annuli which confirm the above results.

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