THE AXISYMMETRICAL INSTABILITY IN WEAKLY MAGNETIZED ACCRETION DISKS

Authors
KUMAR S COLEMAN CS KLEY W
Citation
S. Kumar et al., THE AXISYMMETRICAL INSTABILITY IN WEAKLY MAGNETIZED ACCRETION DISKS, Monthly Notices of the Royal Astronomical Society, 266(2), 1994, pp. 379-385
Citations number
8
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Monthly Notices of the Royal Astronomical Society → ACNP
ISSN journal
00358711
Volume
266
Issue
2
Year of publication
1994
Pages
379 - 385
Database
ISI
SICI code
0035-8711(1994)266:2<379:TAIIWM>2.0.ZU;2-K
Abstract
The energy principle is used to find the global criteria for stability to axisymmetric perturbations of stationary, magnetized, differential ly rotating flows, in particular accretion discs. It is found that the vertical fields usually tend to stabilize while the toroidal fields d estabilize, except when the vertical fields are weak. Bounds are place d on the growth rates of the instability. Normal modes are computed fo r fields in slender annuli which confirm the above results.