  We discuss possible distortions of the ionization history of the Universe in
the model with small scale baryonic clouds. The corresponding scales of the
clouds are much smaller than the typical galactic mass scales. These clouds are
considered in a framework of the cosmological model with the isocurvature and
adiabatic perturbations. In this model the baryonic clouds do not influence on
the cosmic microwave background anisotropy formation directly as an additional
sources of perturbations, but due to change of the kinetics of the hydrogen
recombination . We also study the corresponding distortions of the anisotropy
and polarization power spectra in connection with the launched MAP and future
PLANCK missions.
