Global and unified analysis of solar neutrino data

We discuss the status of the oscillation solutions of the solar neutrino problem into active or sterile neutrinos. We present the results of a global fit to the full data set corresponding to the latest Super-Kamiokande (SK) data on the total event rate, their day-night dependence and the recoil electron energy spectrum, together with the data from Chlorine and Gallium experiments presented at the nu -2000 conference. We show the possible solutions in the full parameter space for oscillations including both MSW and vacuum, as well as quasi-vacuum oscillations (QVO) and matter effects for mixing angles in the second octant (the so called dark side). We quantify our results in terms of allowed regions as well as the goodness of the fit (GOF) for the different allowed solutions. We also present the results in the framework of four neutrino oscillations which allows for intermediate oscillations into a state which is a combination of active and sterile neutrino.