STATUS OF SOLAR NEUTRINO EXPERIMENTS

The present status of all four running solar neutrino experiments is r eviewed. Updated results from the Chlorine, Kamiokande and SAGE detect ors are presented along with the first result from the CALLEX detector [83 +/- 19 (stat.) +/- 8 (syst.) SNU]. This number, while consistent with the presence of the full pp neutrino flux as predicted by the Sta ndard Solar Model, confirms the reduced fluxes of high energy solar ne utrinos observed in the Chlorine and Kamiokande experiments. Possible scenarios (non-standard solar models, neutrino mixing, neutrino decay and the interaction of magnetic fields in the solar convective zone wi th a possible magnetic moment of the neutrino) are discussed in order to explain the deviations between the Standard Solar Model predictions and the actual experimental data.