  Solar magnetism is measured with different indexes: for instance the MPSI and
the MWSI, number of sunspots, radio flux at 10.7 cm, Ca II K, Mg II K, EUV, He
I or L_alpha. Bachmann & White (1994) had compared these indicators of the
solar activity showing a hysteresis of the solar cycle variations and a time
lag between these indices not related to instrumental effects. Later on, Ozguc
& Atac (2001) extended this study of hysteresis phenomenon between Flare index
and other solar indices (mean magnetic field, coronal index). In its original
working configuration, GOLF/SoHO was able to measure during 26 days the solar
mean magnetic field (Garcia et al. 1999). We check here if the velocity data
could be used as another solar magnetism proxy with the advantage of having a
duty cycle >95% during the last 12 years. We will compare the GOLF data with
some of the above-mentioned solar activity indexes.
