Instability of a streaming jet under the influence of vacuum magnetic fields

• Published in: Astrophysics and space science Vol. 158; no. 2; pp. 281 - 295
• Main Authors: Radwan, Ahmed E., Elazab, Samia S.
• Format: Journal Article
• Language: English
• Published: Dordrecht Kluwer 01.08.1989
• Subjects: Astronomy; Earth, ocean, space; Exact sciences and technology; Fundamental aspects of astrophysics; Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations; Magnetohydrodynamics and plasmas; Magnetohydrodynamics; Numerical data; Alfven wave; Dispersion relation; Digital simulation; MHD instability; Jet; Perturbation; Boundary condition; Magnetic field; Equilibrium equation
• ISSN: 0004-640X; 1572-946X
• DOI: 10.1007/BF00639730

The magnetohydrodynamic stability of a streaming liquid cylinder subject to surface tension and pervaded by a magnetic vacuum field has been elaborated for all axisymmetric and non-axisymetric disturbances. The dispersion relation is obtained and studied analytically and numerically. The streaming has always a destabilizing effect. The axial magnetic fields inside and outside the jet have always stabilizing effects for all perturbations. The transverse magnetic field has a destabilzing effect. However, if the axial field intensity is so high and paramount over that of the transverse field, the destabilizing character of the model is suppressed. The latter is satisfied if the Alfven wave velocity is greater than the equilibrium liquid velocity. (Author)