Non-adiabatic discrete Alfven waves in coronal loops and prominences

Details Non-adiabatic discrete Alfven waves in coronal loops and prominences Non-adiabatic discrete Alfven waves in coronal loops and prominences

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993soph..144..267k&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 144, no. 2, p. 267-281.

Physics

1

Coronal Loops, Magnetohydrodynamic Waves, Nonadiabatic Conditions, Solar Physics, Solar Prominences, Cylindrical Plasmas, Magnetohydrodynamic Stability, Plasma Oscillations, Propagation Modes, Wentzel-Kramer-Brillouin Method

Scientific paper

Discrete Alfven waves in coronal loops and prominences are investigated in non-ideal magnetohydrodynamics. The non-ideal effects included are anisotropic, thermal conduction, and optically thin radiation. The classic ideal Alfven continuum is not altered by these non-ideal effects, but the discrete Alfven modes, which exist under certain conditions above or below the Alfven continuum in ideal MHD, are shown to be influenced by non-adiabatic effects. The existence of discrete, non-adiabatic Alfven waves, and their damping and overstability are examined for 1 D cylindrical equilibrium states with twisted magnetic fields. First, analytic results are obtained for modes of-high radial order by means of a WKB-analysis. The subspectrum of discrete Alfven modes is computed with a numerical code, with particular emphasis on the modes of low radial order. The results show that discrete Alfven waves are of potential importance for solar applications and also that the information obtained with the WKB-analysis is of limited use in this context.

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