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First View of the Solar Core from Golf Acoustic Modes

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Abstract

After 8 months of nearly continuous measurements the GOLF instrument, aboard SOHO, has detected acoustic mode frequencies of more than 100 modes, extending from 1.4 mHz to 4.9 mHz. In this paper, we compare these results with the best available predictions coming from solar models. To verify the quality of the data, we examine the asymptotic seismic parameters; this confirms the improvements achieved in solar models during the last decade.

Using the GOLF set of frequencies for l=0, 1, 2, 3 combined with the LOWL second year data set for l > 3 we then carry out inversions to infer properties of the solar core.

This largely confirms the previous results down to around 0.1 R⊙, while there remain differences, even closer to the centre, where the present study shows an extreme sensitivity of the inversion results to the values of the frequencies. We finally consider physical processes which may influence directly or indirectly the solar core structure.

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Authors and Affiliations

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

    S. Turck-Chièze, A. S. Brun & R. A. Garcia

  2. Teoretisk Astrofysik Center, Danmarks, Grundforskningsfond, Danmark

    S. Basu & J. Christensen-Dalsgaard

  3. Institut for Fysik og Astronomi, Aarhus Universitet, DK 8000, Aarhus C, Denmark

    J. Christensen-Dalsgaard, P. Boumier, J. Charra & A. H. Gabriel

  4. Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA, 02138, MS16, U.S.A

    A. Eff-Darwich

  5. Institute of Astronomy, Madingley Road, Cambridge, CB3 OHA, U.K

    I. Lopes

  6. Instituto de Astrofisica de Canarias, E-38205, La Laguna, Tenerife, Spain

    F. Pérez Hernández, F. Baudin & T. Roca Cortés

  7. Departement Cassini, OCA, BP 229, 06304, Nice Cedex 4, France

    G. Berthomieu, J. Provost, G. Grec & C. Renaud

  8. Department of Physics and Astronomy, Ucla, Los Angeles, U.S.A

    R. K. Ulrich

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

    J. M. Robillot

  10. National Solar Observatory, National Optical Astronomy Observatories, PO Box 26732, Tucson, AZ, 85726, U.S.A

    F. Baudin

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  1. S. Turck-Chièze
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  2. S. Basu
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  3. A. S. Brun
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  4. J. Christensen-Dalsgaard
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  6. I. Lopes
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  7. F. Pérez Hernández
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  8. G. Berthomieu
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  9. J. Provost
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  10. R. K. Ulrich
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  11. F. Baudin
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  12. P. Boumier
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  13. J. Charra
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  14. A. H. Gabriel
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  18. J. M. Robillot
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  19. T. Roca Cortés
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Turck-Chièze, S., Basu, S., Brun, A.S. et al. First View of the Solar Core from Golf Acoustic Modes. Sol Phys 175, 247–265 (1997). https://doi.org/10.1023/A:1004992727541

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