Abstract
The MFD oscillating Alfven surface waves along a perfectly conducting annular gas jct surrounding a tar column under oblique varying magnetic field has been discussed. Numerous reported works could be recovered as limiting cases. The axial magnetic fields interior and exterior the model are stabilizing while the tenuous azimuthal field is so or not according to restrictions. The thicker the tar column the larger its stabilizing influence; and the oscillation states arc slowed down so easier observations are allowed than in the classical case of full fluid jet in vacuum with constant magnetic fields (Uberio and Somasundaram 1980). The Alfven wave velocity is decreasing with increasing azimuthal-longitudinal magnetic fields intensities ratio. The phase (dispersive) velocity of the wave propagation relative to Alfven wave velocity is monotonic increasing with decreasing the perturbed wavelength.
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