The stability of current-carrying jets

Statistics – Computation

Scientific paper

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Interstellar Magnetic Fields, Magnetohydrodynamic Flow, Plasma Jets, Radio Galaxies, Computational Astrophysics, Flow Geometry, Flow Stability, Magnetic Field Configurations

Scientific paper

The stability of supermagnetosonic current-carrying jets is examined on the basis of ideal magnetohydrodynamics. The stability properties are compared to hydrodynamic and magnetohydrodynamic flows that carry no poloidal current. This allows to separate the effects of a purely poloidal magnetic field and a helical configuration corresponding to an electric current. Two equilibria with different current profile representative of an early propagation phase and of a kpc-jet surrounded by a cocoon are considered. The currents are in both cases balanced by a return current of equal size. A normal mode analysis is performed, and results are presented for the pinch and kink modes. Current-carrying jets prove to be more stable than their current-free counterparts. Short wavelength instabilities are suppressed for both the current-carrying and current-free magnetically dominated jets, in contrast to the purely hydrodynamic one. The results give strong support to the hydromagnetic origin of jets.

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