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First Results on it p Modes from GOLF Experiment

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Abstract

The GOLF experiment on the SOHO mission aims to study the internal structure of the Sun by measuring the spectrum of global oscillations in the frequency range 10-7 to 10-2 Hz. Here we present the results of the analysis of the first 8 months of data. Special emphasis is put into the frequency determination of the p modes, as well as the splitting in the multiplets due to rotation. For both, we show that the improvement in S/N level with respect to the ground-based networks and other experiments is essential in achieving a very low-degree frequency table with small errors ∼ 2 parts in 10-5). On the other hand, the splitting found seems to favour a solar core which does not rotate slower than its surface. The line widths do agree with theoretical expectations and other observations.

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Authors and Affiliations

  1. Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain

    F. Baudin, P. L. Pallé, F. Pérez Hernández, C. Régulo & T. Roca Cortés

  2. Observatoire de la Côte d'Azur, Lab. Cassini CNRS URA1362, 06304, Nice, France

    M. Lazrek, G. Grec & C. Renaud

  3. Astronomy Department, University of California Los Angeles, U.S.A

    L. Bertello & R. K. Ulrich

  4. Service d'Astrophysique, DSM/DAPNIA, CE Saclay, 91191, Gif-sur-Yvette, France

    R. A. García, C. Gouiffes & S. Turck-Chièze

  5. Institut d'Astrophysique Spatiale, CNRS/Université Paris XI, 91405, Orsay, France

    P. Boumier, J. Charra & A. H. Gabriel

  6. Observatoire de l'Université, Bordeaux 1, BP 89, 33270, Floirac, France

    J.-M. Robillot

  7. Centre National de la Recherche, CNCPRST, Rabat, Morocco

    M. Lazrek

  8. National Solar Observatory, NOAO, PO Box 26732, Tucson, AZ-, 85726, U.S.A

    F. Baudin

  9. U.M.R. 6525, C.N.R.S. et Université de Nice-Sophia Antipolis, F-06108, Nice Cedex 2, France

    D. Fierry-Fraillon, E. Fossat & B. Gelly

Authors
  1. M. Lazrek
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  2. F. Baudin
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  3. L. Bertello
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  4. P. Boumier
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  5. J. Charra
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  6. D. Fierry-Fraillon
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  7. E. Fossat
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  8. A. H. Gabriel
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  9. R. A. García
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  10. B. Gelly
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  11. C. Gouiffes
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  12. G. Grec
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  13. P. L. Pallé
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  14. F. Pérez Hernández
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  15. C. Régulo
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  16. C. Renaud
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  17. J.-M. Robillot
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  18. T. Roca Cortés
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  19. S. Turck-Chièze
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  20. R. K. Ulrich
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Lazrek, M., Baudin, F., Bertello, L. et al. First Results on it p Modes from GOLF Experiment. Sol Phys 175, 227–246 (1997). https://doi.org/10.1023/A:1004942929956

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