The Earth's magnetosphere is a highly dynamical system, which continuously exchanges energy, mass and momentum with the solar wind and the Earth's ionosphere. Existing literature would suggest that particular large amplitude interplanetary Alfvin wave trains might cause intense auroral activities known as High-Intensity Long-Duration Continuous Auroral Activity (HILDCAAs), as a result of the magnetic reconnection between the southward magnetic field z component and the magnetopause magnetic fields. This paper presents a statistical analysis concerning the role played by Alfvinic turbulence in the solar wind-magnetosphere coupling as a function of the solar cycle. We find that Alfvinic fluctuations are geoeffective at solar minimum while at solar maximum magnetic structures play a role.