Three-minute oscillations in sunspots: Seismology of sunspot atmospheres

@article{Zhugzhda2007ThreeminuteOI,
  title={Three-minute oscillations in sunspots: Seismology of sunspot atmospheres},
  author={Yu. D. Zhugzhda},
  journal={Astronomy Letters},
  year={2007},
  volume={33},
  pages={622-643}
}
We show that no eigenmodes of sunspot oscillations with periods of ∼ 3 min or shorter exist. A complex spectrum of the 3-min oscillations arises, because the sunspot atmosphere is a multiband filter for slow MHD waves. To ascertain why the filter transmission bands appear, we have investigated the propagation of waves through a sunspot atmosphere using both multilayered isothermal model atmospheres and various empirical model atmospheres. It turns out that there are several different mechanisms… CONTINUE READING

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