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

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

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985soph...99..119c&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 99, Sept. 1985, p. 119-132. Research supported by the University of Sydney.

Physics

5

Coronal Loops, Magnetohydrodynamic Stability, Solar Corona, Solar Magnetic Field, Surface Waves, Current Sheets, Wave Dispersion, Wave Equations, Wave Propagation

Scientific paper

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 Alfven wave is found to exist, with damping of the wave when Alfven 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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