Time–distance helioseismology

  title={Time–distance helioseismology},
  author={T. Duvall and S. M. Jeffferies and J. Harvey and M. Pomerantz},
THE application of seismology to the study of the solar interior1, 2(helioseismology) has advanced almost solely by the prediction and measurement of the Sun's frequencies of free oscillation, or normal modes. Direct measurement of the travel times and distances of individual acoustic waves—the predominant approach in terrestrial seismology3—would appear to be more difficult in view of the number and stochastic nature of solar seismic sources. Here, however, we show that it is possible to… Expand
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