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Astron. Astrophys. 346, 626-632 (1999)

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The integrated magnetic field of the Sun as seen by GOLF on board SOHO

R.A. García 1,2, P. Boumier 3, J. Charra 3, T. Foglizzo 1, A.H. Gabriel 3, G. Grec 4, C. Régulo 2, J.M. Robillot 5, S. Turck-Chièze 1 and R.K. Ulrich 6

1 Service d'Astrophysique, CEA/DSM/DAPNIA, CE Saclay, F-91191 Gif sur Yvette, France
2 Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain
3 Institut d'Astrophysique Spatiale, CNRS/Université Paris XI, F-91405 Orsay, France
4 Observatoire de la Côte d'Azur, Lab. Cassini CNRS URA1362, F-06304 Nice, France
5 Observatoire de l'Université Bordeaux 1, B.P. 89, F-33270 Floirac, France
6 Department of Physics and Astronomy, UCLA, Los Angeles, CA 90095-1562, USA

Received 30 March 1998 / Accepted 8 February 1999

Abstract

An objective of the GOLF experiment (Global Oscillations at Low Frequencies) on-board the SOHO (Solar and Heliospheric Observatory) space mission was to measure the line-of-sight component of the disk-averaged magnetic field of the Sun.

In this paper, a theoretical study of this observable is presented. The newly developed techniques are tested using simulated data series based on the observation of this experiment, and the sensitivity of GOLF to magnetic measurements is calculated. An average solar mean magnetic field of 0.120 [FORMULA] 0.002 G has been found corresponding to the minimum of solar activity by analyzing 26 days of full GOLF data. The power spectrum of this field is calculated and the main characteristics are described.

Key words: Sun: oscillations – Sun: magnetic fields – methods: data analysis

Send offprint requests to: rgarcia@cea.fr

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© European Southern Observatory (ESO) 1999

Online publication: May 21, 1999
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