Abstract
AbstractThe MHD spectrum of discrete kink modes is derived for a cylindrical, static and isothermal plasma with spatial variations in radial direction only. Such a configuration models, in first approximation, the long and almost radially oriented fine structures of the solar corona denominatedcoronal rays, whenever cylindrical symmetry holds. Since here gravity is not taken into account, the application of the results is limited to longitudinal wavelengths not greater than the density scale of height. The predicted eigenfrequencies of slow magnetoacoustic modes are potentially observable in eclipses and may constitute a diagnostics of the axial electric current and the degree of twisting of the magnetic field.
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