Abstract
Linear calculations of undamped longitudinal waves in thin solar magnetic flux tubes are presented. The influence of such waves, having a variety of parameters, on the Stokes I and V profiles of eight photospheric spectral lines is studied. Diagnostics based on the Stokes parameters of the properties of flux tube waves, in particular of the amount of energy transported by them into the upper solar atmosphere, are developed. For propagating waves it is found that, with an appropriate choice of spectral lines, a lower limit on the transported energy can be set by observing the zero-crossing wavelength of Stokes V, while an upper limit can be derived from the line-widths. The importance of radiative transfer effects and of the thermodynamic changes associated with the waves are pointed out
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