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I describe the current status of the solar neutrino problem, summarizing thearguments that its resolution will require new particle physics. The phenomenonof matter-enhanced neutrino oscillations is reviewed. I consider theimplications of current experiments -- including the SuperKamiokandeatmospheric and LSND measurements -- and the need for additional constraintsfrom SNO and other new detectors.

Neutrino Oscillations and the Solar Neutrino Problem