Solar Physics

, Volume 162, Issue 1–2, pp 61–99

Global Oscillations at Low Frequency from the SOHO mission (GOLF)

  • A. H. Gabriel
  • G. Grec
  • J. Charra
  • J. -M. Robillot
  • T. Roca Cortés
  • S. Turck-Chièze
  • R. Bocchia
  • P. Boumier
  • M. Cantin
  • E. Cespédes
  • B. Cougrand
  • J. Crétolle
  • L. Damé
  • M. Decaudin
  • P. Delache
  • N. Denis
  • R. Duc
  • H. Dzitko
  • E. Fossat
  • J. -J. Fourmond
  • R. A. García
  • D. Gough
  • C. Grivel
  • J. M. Herreros
  • H. Lagardère
  • J. -P. Moalic
  • P. L. Pallé
  • N. Pétrou
  • M. Sanchez
  • R. Ulrich
  • H. B. van der Raay
Article

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. Bothp andg mode oscillations will be investigated, with the emphasis on the low order long period waves which penetrate the solar core. The instrument employs an extension to space of the proven ground-based technique for measuring the mean line-of-sight velocity of the viewed solar surface. By avoiding the atmospheric disturbances experienced from the ground, and choosing a non-eclipsing orbit, GOLF aims to improve the instrumental sensitivity limit by an order of magnitude to 1 mm s−1 over 20 days for frequencies higher than 2.10−4 Hz. A sodium vapour resonance cell is used in a longitudinal magnetic field to sample the two wings of the solar absorption line. The addition of a small modulating field component enables the slope of the wings to be measured. This provides not only an internal calibration of the instrument sensitivity, but also offers a further possibility to recognise, and correct for, the solar background signal produced by the effects of solar magnetically active regions. The use of an additional rotating polariser enables measurement of the mean solar line-of-sight magnetic field, as a secondary objective.

Key words

sun helioseismology 

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Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • A. H. Gabriel
    • 1
  • G. Grec
    • 2
  • J. Charra
    • 1
  • J. -M. Robillot
    • 3
  • T. Roca Cortés
    • 4
  • S. Turck-Chièze
    • 5
  • R. Bocchia
    • 3
  • P. Boumier
    • 1
  • M. Cantin
    • 5
  • E. Cespédes
    • 4
  • B. Cougrand
    • 1
  • J. Crétolle
    • 5
  • L. Damé
    • 6
  • M. Decaudin
    • 1
  • P. Delache
    • 7
  • N. Denis
    • 5
  • R. Duc
    • 5
  • H. Dzitko
    • 5
  • E. Fossat
    • 2
  • J. -J. Fourmond
    • 1
  • R. A. García
    • 4
  • D. Gough
    • 8
  • C. Grivel
    • 1
  • J. M. Herreros
    • 4
  • H. Lagardère
    • 1
  • J. -P. Moalic
    • 1
  • P. L. Pallé
    • 4
  • N. Pétrou
    • 5
  • M. Sanchez
    • 4
  • R. Ulrich
    • 9
  • H. B. van der Raay
    • 10
  1. 1.Institut d'Astrophysique SpatialeCNRS/Université Paris XIOrsayFrance
  2. 2.Département d'Astrophysique, CNRS URA 709Université de NiceNiceFrance
  3. 3.Observatoire de l'Université Bordeaux 1FloiracFrance
  4. 4.Instituto de Astrofísica de CanariasLa Laguna, TenerifeSpain
  5. 5.Service d'AstrophysiqueDSM/DAPNIAGif-sur-YvetteFrance
  6. 6.Service d'AéronomieVerrières-le BuissonFrance
  7. 7.Observatoire de la Côte d'AzurLab. Cassini CNRS URA1362NiceFrance
  8. 8.Dept. of Applied Math. and Theor. PhysicsUniversity of CambridgeEngland
  9. 9.Astronomy DepartmentUniversity of California Los AngelesU.S.A.
  10. 10.Department of PhysicsUniversity of BirminghamEngland

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