  The knowledge of the parameters of the solar neutrino oscillation model,
provided by the SNO and Super-Kamiokande collaborations, enables us to obtain,
with the Wolfenstein equation, a simple and clear analytical and numerical
picture of the transformation of the neutrino state during its travel inside
the Sun. We show that the resulting picture is not implicated in the
characteristics of the neutrino state at the surface of the Sun and at the
surface of the Earth. This circumstance with taking into account the volume
distribution of solar neutrino sources indicates an obvious contradiction
between the consequences of the MSW mechanism with parameters from SNO and
Super-Kamiokande and the results of three of the five observed processes with
solar neutrinos. Erroneous assertions at the base of the MSW mechanism are
noted.
