Instabilities in transmagnetosonic jets.

Details Instabilities in transmagnetosonic jets. Instabilities in transmagnetosonic jets.

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...314..995a&link_type=abstract

Astronomy and Astrophysics, v.314, p.995-1002

Astronomy and Astrophysics

Astrophysics

22

Instabilities, Magnetohydrodynamics, Methods: Numerical, Ism: Jets And Outflows, Galaxies: Jets

Scientific paper

We analyze the stability of a cold jet with a linear force-free magnetic field. Non-axisymmetric Kelvin-Helmholtz and current-driven instabilities are studied. The current is destabilizing for Kelvin-Helmholtz modes in the transmagnetosonic regime, in contrast to super-fast magnetosonic flows. Growth however remains slower than for hydrodynamic flows. It is shown that growth rates of current-driven modes are an order of magnitude smaller than for Kelvin-Helmoltz modes. Only for quite small fast magnetosonic Mach numbers, M<~0.5, both become comparable. Current-driven instabilities are therefore unlikely to be dangerous for the integrity of supermagnetosonic collimated jets. The current-driven perturbations do not propagate in the frame of the jet. For them the jet boundary becomes effectively rigid at high fast-magnetosonic Mach numbers.

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