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Resonant behaviour of MHD waves on magnetic flux tubes

II. Absorption of sound waves by sunspots

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Abstract

The absorption of solar five-min oscillations by sunspots is interpreted as the resonant absorption of sound waves by a magnetic cylinder. The absorption coefficient is calculated both analytically under certain simplifying assumptions, and numerically under more general conditions. The observed magnitude of the absorption coefficient, which is up to 0.5 or even more, can be explained for suitable ranges of parameters. Limitations in the present model are also discussed.

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Authors and Affiliations

  1. National Astronomical Observatory, Mitaka, Tokyo, Japan

    Takashi Sakurai

  2. Astronomisch Instituut, Katholieke Universiteit Leuven, Belgium

    Marcel Goossens

  3. Space Science Center, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, U.S.A.

    Joseph V. Hollweg

Authors
  1. Takashi Sakurai
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  2. Marcel Goossens
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  3. Joseph V. Hollweg
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Sakurai, T., Goossens, M. & Hollweg, J.V. Resonant behaviour of MHD waves on magnetic flux tubes. Sol Phys 133, 247–262 (1991). https://doi.org/10.1007/BF00149889

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  • DOI: https://doi.org/10.1007/BF00149889

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