Seasonal variations in solar high-energy neutrino flux and their probable source

Cyclic variations of the solar neutrino flux (Homestake detector data) have been analyzed both from season to season and within different seasons and were compared with the corresponding variations of the large-scale deep-lay er solar magnetic field. The analysis revealed a seasonal variation of the flux in the last twenty years with extremes at equinox epochs. The mechanis m of this variation can be due to the asymmetry in magnitudes or to the twi sting of the large-scale magnetic fields in the southern and northern hemis pheres of the Sun in the flux modulation region.