Abstract

Recently the present authors explained oscillations observed in the umbral chromosphere and transition region (TR) by the action of a chromospheric resonator, that is by slow, quasi-longitudinal magneto-atmospheric waves which are partly trapped between temperature minimum (Tmin) and TR. Subsequently the model has been extended to a photospheric-chromospheric resonator (a) by considering additional reflections from the lower photosphere; two subphotospheric resonators for the fast (quasi-longitudinal, acoustic) wave (b) and for the slow (quasi-transverse) wave (c) and their coupling with the atmospheric resonator (a) have been investigated as well.

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