Matter effects on neutrino oscillations

We calculate matter effects on neutrino oscillations in long baseline experiments, using actual density profiles in the Earth. We study the dependence of the signal on E/Deltam(atm)(2), the angles in the leptonic mixing matrix and the influence of Deltam(sol)(2) and CP phase on the oscillations. The results show quantitatively how matter effects can cause significant changes in the oscillation probabilities. These effects can be useful in amplifying certain neutrino oscillation signals and helping one to obtain measurements of mixing parameters and the magnitude and sign of Deltam(atm)(2).