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Performance and Early Results from the Golf Instrument Flown on the Soho Mission

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Abstract

GOLF in-flight commissioning and calibration was carried out during the first four months, most of which represented the cruise phase of SOHO towards its final L1 orbit. The initial performance of GOLF is shown to be within the design specification, for the entire instrument as well as for the separate sub-systems. Malfunctioning of the polarising mechanisms after 3 to 4 months operation has led to the adoption of an unplanned operating sequence in which these mechanisms are no longer used. This mode, which measures only the blue wing of the solar sodium lines, detracts little from the detection and frequency measurements of global oscillations, but does make more difficult the absolute velocity calibration, which is currently of the order of 20%. Data continuity in the new mode is extremely high and the instrument is producing exceptionally noise-free p-mode spectra. The data set is particularly well suited to the study of effects due to the excitation mechanism of the modes, leading to temporal variations in their amplitudes. The g modes have not yet been detected in this limited data set. In the present mode of operation, there are no indications of any degradation which would limit the use of GOLF for up to 6 years or more.

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Authors and Affiliations

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

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

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

    G. Grec, M. Lazrek & C. Renaud

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

    J.-M. Robillot

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

    T. Roca Cortés, F. Baudin, J. M. Herreros, P. L. Pallé & C. Régulo

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

    S. Turck-Chièze, H. Dzitko, T. Foglizzo, R. A. García & N. Pétrou

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

    R. Ulrich & L. Bertello

  7. Teoretisk Astrofysik Center, Danmarks Grundforskningsfond, Denmark

    S. Basu

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

    F. Baudin

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

    J. Christensen-Dalsgaard

  10. Département d'Astrophysique, CNRS URA709, Université de Nice, 06034, Nice, France

    E. Fossat

  11. Centre Nationale de la Recherche, CNCPRST, Rabat, Morocco

    M. Lazrek

Authors
  1. A. H. Gabriel
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  2. J. Charra
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  3. G. Grec
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  4. J.-M. Robillot
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  5. T. Roca Cortés
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  6. S. Turck-Chièze
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  7. R. Ulrich
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  8. S. Basu
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  9. F. Baudin
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  10. L. Bertello
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  11. P. Boumier
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  12. M. Charra
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  13. J. Christensen-Dalsgaard
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  14. M. Decaudin
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  15. H. Dzitko
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  16. T. Foglizzo
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  17. E. Fossat
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  18. R. A. García
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  19. J. M. Herreros
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  20. M. Lazrek
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  21. P. L. Pallé
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  22. N. Pétrou
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  23. C. Renaud
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  24. C. Régulo
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Gabriel, A.H., Charra, J., Grec, G. et al. Performance and Early Results from the Golf Instrument Flown on the Soho Mission. Sol Phys 175, 207–226 (1997). https://doi.org/10.1023/A:1004911408285

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  • DOI: https://doi.org/10.1023/A:1004911408285

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