The quasi-biennial modulation of solar neutrino flux, solar and galactic cosmic rays by the solar cyclic activity

Using some solar activity indicators like sunspot areas and green-line coronal emissions during the period 1974-2001, we find that the quasi-biennial periodicity is a fundamental mode of solar variability. We provide evidences for the quasi-biennial modulation of the solar neutrino flux, thus supporting the hypothesis of a connection between solar neutrinos and solar magnetic fields, probably through the direct interaction with neutrino magnetic moment. The same periodic modulation has been detected when fluxes of solar energetic protons and galactic cosmic rays are investigated. This modulation re