  The Standard Solar Model (SSM) is no more sufficient to interpret all the
observations of the radiative zone obtained with the SoHO satellite. We recall
our present knowledge of this internal region and compare the recent results to
models beyond the SSM assumptions. Then we discuss the missing processes and
quantify some of them in using young analog observations to build a more
realistic view of our star. This progress will be useful for solar-like stars
observed by COROT and KEPLER.
