  We consider the day-night asymmetries predicted by MSW solutions of the solar
neutrino problem. The integration over the neutrino energy, as well as over the
production region or over the time intervals of more than a day leads to the
averaging of oscillations on the way to the earth. This is equivalent to
considering the neutrino state arriving at the surface of the earth as an
incoherent mixture of the neutrino mass eigenstates (even if there is no
divergence of wavepackets). As a consequence, the $\nu_e$-regeneration effect
inside the earth is incoherent, in contrast with the result in hep-ph/9902435.
