Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...283..532f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 283, Aug. 15, 1984, p. 532-539.
Astronomy and Astrophysics
Astronomy
39
Interstellar Magnetic Fields, Kelvin-Helmholtz Instability, Magnetohydrodynamic Stability, Particle Beams, Radio Jets (Astronomy), Astronomical Models, Cylindrical Plasmas, Helical Flow, Intergalactic Media, Pinch Effect, Vortex Sheets
Scientific paper
The linearized MHD dispersion relation is exactly solved numerically for a cylindrical vortex sheet under a wide range of conditions appropriate for extragalactic radio jets. In the zero-field, hydrodynamic, limit empirical expressions are derived which allow one to estimate simply the growth rates of instabilities. The expressions for maximally disruptive growth rates can be used to evaluate the propagation of jets before disruption, to compare the physical properties of different radio sources, and to study instability induced eddies for application to particle reacceleration schemes. The influence of axial magnetic fields is studied in the V(A)/S(b) less than 1 regime, with V(A) and S(b) the Alfven and beam sound speeds. Perturbations are stabilized by the fields. Some preliminary calculations based on helical fields are reported.
Fiedler R.
Jones Thomas W.
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