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In the context of solar neutrino oscillations among active states, we brieflydiscuss the current likelihood of Mikheyev-Smirnov-Wolfenstein (MSW) solutionsto the solar neutrino problem, which appear to be currently favored at largemixing, where small Earth regeneration effects might still be observable inSuper-Kamiokande (SK) and in the Sudbury Neutrino Observatory (SNO). We pointout that, since such effects are larger at high (low) solar neutrino energiesfor high (low) values of the mass square difference \delta m^2, it may beuseful to split the night-day rate asymmetry in two separate energy ranges. Weshow that the difference \Delta of the night-day asymmetry at high and lowenergy may help to discriminate the two large-mixing solutions at low and high\delta m^2 through a sign test, both in SK and in SNO, provided that thesensitivity to \Delta can reach the (sub)percent level.Comment: 6 pages (RevTeX) + 4 figures (PostScript). Final version, to appear  in Phys. Rev.

Day-night asymmetry of high and low energy solar neutrino events in Super-Kamiokande and in the Sudbury Neutrino Observatory