Speed of sound in the solar interior

@article{ChristensenDalsgaard1985SpeedOS,
  title={Speed of sound in the solar interior},
  author={J. Christensen-Dalsgaard and T. Duvall and D. Gough and J. Harvey and E. Rhodes},
  journal={Nature},
  year={1985},
  volume={315},
  pages={378-382}
}
Frequencies of solar 5-min oscillations can be used to determine directly the sound speed of the solar interior. The determination described here does not depend on a solar model, but relies only on a simple asymptotic description of the oscillations in terms of trapped acoustic waves. 
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