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 new
ly developed techniques are tested using simulated data series based on the
observation;of this experiment, and the sensitivity of GOLF to magnetic me
asurements is calculated. An average solar mean magnetic field of 0.120 +/-
0.002 G has been found corresponding to the minimum of solar activity by a
nalyzing 26 days of full GOLF data. The power spectrum of this field is cal
culated and the main characteristics are described.