Magnetic collimation and magnetohydrodynamic kink instability driven by differential rotation. (English) Zbl 1173.85322
Summary: We investigate the launching and stability of extragalactic jets through magnetohydrodynamic simulations of jet evolution. In these simulations, a small scale equilibrium magnetic corona is twisted by a differentially rotating accretion disk. Two-dimensional calculations show the formation of a collimated outflow. This outflow is divided into two regions by the Alfvén surface: a magnetically dominated Poynting region, and a kinetically dominated region. Three-dimensional calculations show that the outflow is unstable to the \(m=1\) kink instability, and that the growth rate of the kink instability decreases as the rotation rate of the accretion disk increases.
MSC:
85A30 | Hydrodynamic and hydromagnetic problems in astronomy and astrophysics |
76W05 | Magnetohydrodynamics and electrohydrodynamics |
83C10 | Equations of motion in general relativity and gravitational theory |
References:
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