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Accretion disks; hydromagnetics; instability

A two-dimensional instability analysis for a magneto-keplerian disk flow around a compact object is presented here. Using the eigenvalue technique, linearly coupled perturbed equations have been numerically solved within the local approximation. It is concluded that Kelvin-Helmholtz, magnetosonic (fast and slow) and resistive electromagnetic modes exist. However, only the magnetosonic mode can destabilise the disk structure. Further, we discuss the properties of different modes as a function of disk parameters and plot the eigenmode structures for different physical quantities.

S. C. Tripathy¹ C. B. Dwivedi² A. C. Das³ A. R. Prasanna³

1. Udaipur Solar Observatory, Physical Research Laboratory, 11, Vidya Marg, Udaipur - 313001
2. Institute of Advanced Study in Science and Technology, Khanapara, Guwahati - 781022
3. Physical Research Laboratory, Navrangpura, Ahmedabad - 380 009

Published

December 1993

Manuscript received

26 January 1993

Accepted

17 May 1993