Exotic Solutions to the Solar Neutrino Anomaly

We analyze the status of the exotic solutions to the solar neutrino problem, i.e., those solutions based on new phenomena which are not the usual neutrino oscillations induced by masses and mixing. These solutions are based on di erent assumptions: a) resonant spinavor precession induced by non-vanishing neutrino magnetic moment, b) the existence of non-standard avor-changing and non-universal neutrino interactions and c) the violation of the equivalence principle. We investigate the quality of the t provided by each one of these solutions not only to the total rate measured by all solar neutrino experiments but also to the day-night and seasonal variations of the event rate, as well as the recoil electron energy spectrum measured by the SuperKamiokande collaboration.