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Keywords:

  • Sun: helioseismolology;
  • Sun: oscillations;
  • waves

Abstract

The current theory of the high-degree solar f-mode based on an adiabatic approximation is in contradiction with obser-vations, since the f-mode is visible in intensity oscillations of the Sun. As a possible solution we present an universal analytical treatment for a non-adiabatic f-mode. This non-adiabatic theory provides the explanation of brightness oscilla-tions due to the f-mode. We find that the non-adiabatic effects do not lead to a damping of the f-mode since the dispersion relation is the same as in the adiabatic approximation (© 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)