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Intermediate degree solar oscillations

  • T. L. Duvall (a1), J. W. Harvey (a2) and M. A. Pomerantz (a3)

Abstract

Spectra of solar intensity oscillations in the degree range ℓ = 20–98 were obtained with a 92% duty cycle over a 50 hour period from the geographic South Pole. After correction for solar rotation, the spectra have been averaged over azimuthal order m and fit with Lorentzian functions to provide values of background noise, amplitude, frequency and line width for 636 oscillation modes. The background noise is nearly independent of frequency in the range containing strong p-modes. The amplitude envelope shows little dependence on ℓ value and a frequency dependence similar to that of Doppler oscillations but shifted to higher frequency. Line widths increase at higher frequency and at higher ℓ values.

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Copyright

References

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Bevington, P.R.: 1969, Data Reduction and Error Analysis for the Physical Sciences, McGraw Hill, New York, pp. 237239.
Brodsky, M. A. and Vorontsov, S. V.: 1986 (these proceedings).
Brown, T. M.: 1985, Nature 317, 591594.
Christensen-Dalsgaard, J., Duvall, T. L. Jr., Gough, D. O., Harvey, J. W. and Rhodes, E. J. Jr.: 1985, Nature 315, 378382.
Däppen, W. and Gough, D. O.: 1986, in Gough, D. O. (ed.), Seismology of the Sun and the Distant Stars, Reidel, Dordrecht, p. 275.
Duvall, T. L. Jr., Harvey, J. W. and Pomerantz, M. A.: 1986, Nature 321, 500501.
Libbrecht, K. G. and Zirin, H.: 1986, Astrophys. J., in press.

Intermediate degree solar oscillations

  • T. L. Duvall (a1), J. W. Harvey (a2) and M. A. Pomerantz (a3)

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