Solar neutrino observations and neutrino oscillations

The results of recent Kamiokande-II and ³⁷Cl solar-neutrino experiments are quantitatively analyzed assuming the Mikheyev-Smirnov-Wolfenstein solution to the solar-neutrino problem. It is found that the parameter region known as the "large mass" solution to the solar-neutrino problem is disfavored by a little more than 1 σ while the "small mass" and "large angle" solutions are in good agreement at this level. The implications on this analysis from time variations in the data are discussed.