LANZA, Antonino FrancescoAntonino FrancescoLANZACollier Cameron, A.A.Collier CameronHaywood, R. D.R. D.Haywood2020-12-282020-12-2820190035-8711http://hdl.handle.net/20.500.12386/29206The radial velocity (RV) of the Sun as a star is affected by its surface convection and magnetic activity. The moments of the cross-correlation function between the solar spectrum and a binary line mask contain information about the stellar RV and line-profile distortions caused by stellar activity. As additional indicators, we consider the disc-averaged magnetic flux and the filling factor of the magnetic regions. Here we show that the activity-induced radial-velocity fluctuations are reduced when we apply a kernel regression to these activity indicators. The disc-averaged magnetic flux proves to be the best activity proxy over a time-scale of one month and gives a standard deviation of the regression residuals of 1.04 m/s, more than a factor of 2.8 smaller than the standard deviation of the original RV fluctuations. This result has been achieved thanks to the high-cadence and time continuity of the observations that simultaneously sample both the RV and the activity proxies.STAMPAenArticle10.1093/mnras/stz10552-s2.0-85072273000000474903500037https://academic.oup.com/mnras/article/486/3/3459/54547572019MNRAS.486.3459LFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_2 Planetary systems sciences