Abstract
New observations of solar oscillations are reported. Power density spectra derived from these observations reveal narrow-band oscillations that are spatially global, have spatial symmetry properties that are either symmetric or antisymmetric for reflection about the center of the solar disk and also about the solar equator, and have coherence times ≳ 41 days. Large-scale differential refraction effects have been reduced by a factor of 105 over that found in previous solar diameter studies by the design of the experiment; thus, these effects are eliminated as a possible source of the oscillations. A discussion is presented of this reduction as well as other features of the observing and analysis program. It is concluded that the probability is very high that individual normal modes of oscillation of the Sun have been detected in the period range from 2 hr to 10 min.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Brown, T. M., Stebbins, R. T., and Hill, H. A.: 1978, Astrophys. J. 223, 324.
Caudell, T. P. and Hill, H. A.: 1980, Monthly Notices Roy. Astron. Soc. 193, 381.
Caudell, T. P., Knapp, J., Hill, H. A., and Logan, J. D.: 1980, in H. A. Hill and W. A. Dziembowski (eds.), Nonradial and Nonlinear Stellar Pulsation, Lecture Notes in Physics, No. 125, Springer-Verlag, Berlin, p. 206.
Claverie, A., Isaak, G. R., McLeod, C. P., van der Raay, H. B., and Roca Cortes T.: 1981, Nature 293, 443.
Clayton, P. D.: 1973, ‘A Precise Measurement of the Sun's Visual Oblateness’, University of Arizona (Ph. D. Thesis).
Dicke, R. H.: 1978, in G. Friedlander (ed.), Proceedings Informal Conference on Status and Future of Solar Neutrino Research, BNL Report 50879, 2, Brookhaven National Laboratories, Upton, New York, p. 109.
Fossat, E., Grec, G., and Harvey, J. W.: 1981, Astron. Astrophys. 94, 95.
Gough, D. O.: 1978, Proceedings 2nd European Solar Meeting, Toulouse, France, March 8–10.
Groth, E. J.: 1975, Astrophys. J. Suppl. 29, 286.
Hill, H. A.: 1978, in J. A. Eddy (ed.), The New Solar Physics, Westview Press, Boulder, Colorado, Chapter 5.
Hill, H. A. and Caudell, T. P.: 1979, Monthly Notices Roy. Astron. Soc. 186, 327.
Hill, H. A. and Stebbins, R. T.: 1975, Astrophys. J. 200, 471.
Hill, H. A., Stebbins, R. T., and Oleson, J. R.: 1975, Astrophys. J. 200, 484.
Hill, H. A., Bos, R. J., and Caudell, T. P.: 1983, Solar Phys. 82, 129 (this volume).
Isaak, G. R.: 1982, Nature 296, 130.
Knapp, J., Hill, H. A., and Caudell, T. P.: 1980, in H. A. Hill and W. A. Dziembowski (eds.), Nonradial and Nonlinear Stellar Pulsation, Lecture Notes in Physics, No. 125, Springer-Verlag, Berlin, p. 394.
Oleson, J. R., Zanoni, C. A., Hill, H. A., Healy, A. W., Clayton, P. D., and Patz, D. L.: 1974, Appl. Opt. 13, 206.
Patz, D. L.: 1975, ‘An Experimental Method to Determine Small Differences Between the Polar and Equatorial Solar Limb Profiles’, University of Arizona (Ph. D. thesis).
Stratonovich, R. L.: 1963, Topics in the Theory of Random Noise, transl. from the Russian by Richard A. Silverman; Vol.3 in the series: Mathematics and Its Applications, Gordon and Breach Science Publishers, Inc., New York.
Author information
Authors and Affiliations
Additional information
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.
Rights and permissions
About this article
Cite this article
Bos, R.J., Hill, H.A. Detection of individual normal modes of oscillation of the Sun in the period range from 2 hr to 10 min in solar diameter studies. Sol Phys 82, 89–102 (1983). https://doi.org/10.1007/BF00145548
Issue Date:
DOI: https://doi.org/10.1007/BF00145548