Magnetic field modulation issues for improving global solar oscillation measurements from space

  • L. Damé
  • R. K. Ulrich
  • M. Martić
  • P. Boumier
Part IV Observations of Solar Oscillations
Part of the Lecture Notes in Physics book series (LNP, volume 367)


The measurement of global oscillations of the Sun from space will provide the ultimate means by which we will assess the existence, and hopefully observe some of the expected gravity modes. The SOHO-GOLF experiment, with a 4-point measurement in the line profile (resonance scattering method with a variable magnetic field applied to a sodium cell), may be able to distinguish between magnetic effects and true velocities. In this paper we characterize the effects of the magnetic fields and active regions on all aspects of the solar D lines in order to determine the best way to extract this signal from the solar background noise. These preliminary findings are then used to quantify the precision requirements for the GOLF Magnetic Field Modulation measurement method.


Line Profile Magnetic Effect Michelson Doppler Imager Oscillation Measurement Photon Noise 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Cavallini, F., Ceppatelli, G., and Righini, A. 1988, Astron. Astrophys., 205, 278.Google Scholar
  2. Dame, L. 1988, in Seismology of the Sun and Sun-like Stars, ed. E. Rolfe, ESA SP-286 (ESA Publication Division, Noordwijk), p.367.Google Scholar
  3. Damé, L. 1989, Comparison of the Measurement Sensitivity to Global Solar Oscillations of GOLF and the MDI, Helioseismology Symposium, Annales Geophysicæ, Special Issue EGS XIV General Assembly, p.226.Google Scholar
  4. Damé, L., Cezarsky, C., Delache, Ph., Deubner, F. L., Foing, B., Fossat, E., Fröhlich, C., Gabriel, M., Gorisse, M., Gough, D., Grec, G., Pallé, P., Paul, J., Roca Cortés, T., and Stenflo, J.L. 1987, Global Oscillations at Low Frequencies (GOLF)-an Investigation of the Solar Interior, Proposal submitted to ESA and NASA in response to the Announcement of Opportunity SCI (87) 1/OSSA-1-87 for the Solar and Heliospheric Observatory.Google Scholar
  5. Fröhlich, C. 1990, these proceedings.Google Scholar
  6. Harvey J. 1985, in Future Missions in Solar, Heliospheric and Space Plasma Physics, eds. E. Rolfe and B. Battrick, ESA SP-233 (ESA Publication Division, Noordwijk), p.199.Google Scholar
  7. Jiménez, A., Pallé, P.L., Pérez Hernandez, F., Régulo, C., and Roca Cortés, T. 1988, Astron. Astrophys., 192, L7.Google Scholar
  8. Jiménez, A., Pallé, P.L., Régulo, C., Roca Cortés, T., Isaak, G.R., McLeod, C.P., and van der Raay, H.B. 1986, Adv. Spac. Res., 6(8), 89.CrossRefGoogle Scholar
  9. Robillot, J.M., and Bocchia, R. 1989, private communication.Google Scholar
  10. Solanki, S.K. 1989, Astron. Astrophys., 224, 225.Google Scholar
  11. Ulrich, R.K., Boyden, J.E., Webster, L., and Shieber, T. 1989, Magnetically Induced Spectral Line Redshifts Full Disk Measurements, Helioseismology Symposium, Annales Geophysicae, Special Issue EGS XIV General Assembly, p.325.Google Scholar
  12. van der Raay, H.B. 1989, g-Modes Identification Problems and Possibilities, Helioseismology Symposium, Annales Geophysicae, Special Issue EGS XIV General Assembly, p.226.Google Scholar
  13. van der Raay, H.B. 1990, These proceedings.Google Scholar

Copyright information

© Springer-Verlag 1990

Authors and Affiliations

  • L. Damé
    • 1
  • R. K. Ulrich
    • 2
  • M. Martić
    • 3
  • P. Boumier
    • 3
  1. 1.Direction des Etudes de Synthèse, ONERAMeudonFrance
  2. 2.Astronomy Department, UCLALos AngelesUSA
  3. 3.Institut d'Astrophysique SpatialeVerrières-le-BuissonFrance

Personalised recommendations