Spatial stability of the magnetized slab jet

Details Spatial stability of the magnetized slab jet Spatial stability of the magnetized slab jet

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399..478h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 399, no. 2, p. 478-494.

Astronomy and Astrophysics

Astronomy

44

Magnetohydrodynamic Stability, Plasma Jets, Radio Jets (Astronomy), Spatial Distribution, Extragalactic Radio Sources, Galactic Evolution, Perturbation Theory

Scientific paper

A spatial stability analysis of the Kelvin-Helmholtz instability of a magnetized slab jet is performed and compared to results of numerical simulations. Provided the jet is super-Alfvenic the dispersion relation describing the propagation and growth of Fourier components of some initial perturbation admits the same type of solutions as for a purely fluid jet. Supermagnetosonic resonances comparable to the supersonic resonances of a strictly fluid jet exist where resonant wavelengths and growth lengths scale with the magnetosonic Mach number. The resonances disappear when the jet becomes transmagnetosonic but still super-Alfvenic and only the fundamental sinusoidal mode remains. The fundamental mode is stabilized when the jet is sub-Alfvenic, but for jet velocities slightly less than the slow magnetosonic speed reflection modes can grow even on a sub-Alfvenic jet.

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