Perturbations of a twisted solar coronal loop: The relation between surface waves and instabilities |
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| Authors: | N F Cramer I J Donnelly |
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| Institution: | (1) School of Physics, University of Sydney, 2006 Sydney, N.S.W., Australia;(2) Australian Atomic Energy Commission Research Laboratories, 2232 Sutherland, N.S.W., Australia |
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| Abstract: | The spectrum of propagating waves and instabilities on a current-carrying, zero gas pressure, twisted magnetic flux loop is analysed for several models of the magnetic field structure. A surface wave mode of the fast Alfvén wave is found to exist, with damping of the wave when Alfvén resonance absorption occurs. If the loop is surrounded by a uniform, purely axial magnetic field, then the surface wave is always stable. If the loop is surrounded by a nonuniform field which is continuous with the loop's field, then the surface wave may connect to the unstable external kink mode. |
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