Abstract
Observations are reported here which show that the 5-min oscillations in a sunspot umbra actually split into several individual modes of different period. We interpret these modes of oscillation as the response of the sunspot to forcing by the 5-min p-modes in the surrounding quiet atmosphere. Also, we show how detailed observations of the multiple 5-min modes in a sunspot may be used as a probe of the structure of a sunspot beneath the solar surface.
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Thomas, J., Cram, L. & Nye, A. Five-minute oscillations as a subsurface probe of sunspot structure. Nature 297, 485–487 (1982). https://doi.org/10.1038/297485a0
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DOI: https://doi.org/10.1038/297485a0
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