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Abstract: We investigate the launching and stability of extragalactic jets throughnonlinear magnetohydrodynamic MHD simulation and linear eigenmode analysis.In the simulations of jet evolution, a small-scale equilibrium magnetic arcadeis twisted by a differentially rotating accretion disk. These simulationsproduce a collimated outflow which is unstable to the current driven m=1 kinkmode for low rotational velocities of the accretion disk relative to the Alfvenspeed of the coronal plasma. The growth rate of the kink mode in the jet isshown to be inversely related to the rotation rate of the disk, and the jet isstable for high rotation rates. Linear MHD calculations investigate the effectof rigid rotation on the kink mode in a cylindrical plasma. These calculationsshow that the Coriolis force distorts the m=1 kink eigenmode and stabilizes itat rotation frequencies such that the rotation period is longer than a fewAlfven times.



Author: C. S. Carey, C. R. Sovinec

Source: https://arxiv.org/







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