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Perturbations of a twisted solar coronal loop: The relation between surface waves and instabilities

✍ Scribed by N. F. Cramer; I. J. Donnelly

Publisher: Springer
Year: 1985
Tongue: English
Weight: 672 KB
Volume: 99
Category: Article
ISSN: 0038-0938
DOI: 10.1007/bf00157303

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✦ Synopsis

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 Alfvrn wave is found to exist, with damping of the wave when Alfvrn 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. yes no no yes no no Equation (2) Equation (2) no yes pC0

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