Linking solar and long baseline terrestrial neutrino experiments

We show that, in the framework of three light neutrino species with hierarc hical masses and assuming no fine tuning between the entries of the neutrin o mass matrix, one can use the solar neutrino data to obtain information on the element U-e3 of the lepton mixing matrix. Conversely, a measurement of U-e3 in atmospheric or long baseline accelerator or reactor neutrino exper iments would help discriminate between possible oscillation solutions of th e solar neutrino problem.