The Day-Night Effect and MSW Analysis for the Salt Phase of SNO

The Sudbury Neutrino Observatory (SNO) has recently extended its analysis of data from the dissolved-salt phase of the experiment to the full 391-day salt data set. In addition to measurements of the total $^8$B solar neutrino flux, solar neutrino flavor change, and the solar electron neutrino energy spectrum, the recent analysis includes day and night measurements of the electron and total solar neutrino fluxes. A day-night asymmetry in the electron neutrino flux is a prediction of the MSW model for solar neutrino oscillations for some values of the fundamental neutrino parameters, due to the matter effects in the earth. The day-night analysis for the salt phase of SNO will be presented, as well as a discussion of the implications of SNO's salt phase measurements in a global analysis to determine solar neutrino parameters $\Delta{m}^2$ and $\sin^2{\theta}$.