  The paper describes the first results of all-sky polarization measurements of
twilight background started in central Russia in the very beginning of summer
2011. Time-frequent data of sky intensity and polarization over the wide range
of sky point zenith distances is used to separate the multiple scattering and
to build the altitude dependency of scattering coefficient and polarization in
the mesosphere (altitudes from 60 to 90 km) at different angles. Undisturbed
structure of the mesosphere without the noticeable aerosol stratification
during the observation days allows to estimate the atmosphere temperature at
these altitudes.
