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Theoretical Eigenfrequencies of Solar Oscillations of Low Harmonic Degree l in Five-Minute Range*

  • H. Shibahashi (a1) and Y. Osaki (a1)

Abstract

We have calculated eigenfrequencies of radial and nonradial p-mode oscillations with low harmonic index l (l = 0, 1, 2, 3, and 4) for a standard solar model with normal composition and appoximately the correct age. It is found that theoretical eigenfrequencies calculated for our standard model agree approximately with observed peaks in the power spectra for the full-disk five minute oscillation of the Sun (Claverie et al., 1980; Grec et al., 1983; Scherrer et al., 1983) in agreement with other recent works (Christensen-Dalsgaard and Gough, 1980; Scuflaire et al., 1981). However, there still remains a slight discrepancy between theory and observations in such a sense that the theoretical eigenfrequencies are slightly lower than observations (see Figure 1).

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Copyright

Corresponding author

** Present address: Joint Institute for Laboratory Astrophysics, University of Colorado and National Bureau of Standard, Boulder, Colorado.

Footnotes

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*

Proceedings of the 66th IAU Colloquium: Problems in Solar and Stellar Oscillations, held at the Crimean Astrophysical Observatory, U.S.S.R., 1-5 September, 1981.

Footnotes

References

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Berthomieu, G., Cooper, A.J., Gough, D.O., Osaki, Y., Provost, J., and Rocca, A.: 1980, in Hill, H.A. and Dziembowski, W.A. (eds.), Nonradial and Nonlinear Stellar Pulsation, Springer-Verlag, Berlin, p. 307.
Christensen-Dalsgaard, J. and Gough, D.O.: 1980, Nature 288, 544.
Claverie, A., Isaak, G.R., McLeod, C.P., van der Raay, H.B., and Rocca-Cortes, T.: 1980, Astron. Astrophys. 91, L9.
Grec, G., Fossat, E., and Pomerantz, M.: 1983, Solar Phys. 82, 55 (this volume).
Scherrer, P.H., Wilcox, J.M., Christensen-Dansgaard, J., and Gough, D.O.: 1983, Solar Phys. 82, 75 (this volume).
Scuflaire, R., Gabriel, M., and Noels, A.: 1981, Astron. Astrophys. 99, 39.
Shibahashi, H., and Osaki, Y.: 1981, Publ. Astron. Soc. Japan 33, 713.
Ulrich, R.K. and Rhodes, E.J. Jr.: 1977, Astrophys. J. 218, 521.

Theoretical Eigenfrequencies of Solar Oscillations of Low Harmonic Degree l in Five-Minute Range*

  • H. Shibahashi (a1) and Y. Osaki (a1)

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