Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.161..279r&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 161, no. 2, Nov. 1989, p. 279-293.
Astronomy and Astrophysics
Astrophysics
Cylindrical Plasmas, Electromagnetic Radiation, Liquid-Gas Mixtures, Magnetohydrodynamic Stability, Boundary Value Problems, Perturbation Theory, Physical Properties
Scientific paper
The magnetohydrodynamic stability of a finite hollow jet acting it up on the capillarity, inertia and electromagnetic forces has been developed. A general eigenvalue relation is derived and studied analytically and the results are confirmed numerically and interpreted physically to all possible modes of perturbations. The model is capillary unstable to small axisymmetric disturbance and stable for all other disturbances. The model is magnetodynamic stable to all possible modes of perturbations for all (short and long) wavelengths. The magnetic field exerts a strong stabilizing influence not only to axisymmetric disturbance which causes only the bending of the magnetic lines of force but also to the nonaxisymmetric disturbances that also leads to twisting of lines. It is found that the capillary instability is quickly decreasing with increasing the magnetic field intensities and, moreover, above a certain value of the basic magnetic field the capillary instability is completely suppressed and stability sets in. Numerous reported works are recovered as limiting cases from the present general work.
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