Time-Variations of Solar Neutrino Signals
  The most popular solutions of the solar neutrino problem which assume massive neutrinos predict varying with time signals in the solar neutrino detectors. The variations represent a distinctive feature of these solutions and do not depend on the theoretically predicted total flux of neutrinos from the Sun. The sensitivity of SuperKamiokande and SNO to day-night variations due to regeneration in the Earth is estimated. 
P.I. Krastev (Inst. for Advanced Study)