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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)

Abstract

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.

Keywords

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.

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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

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