  This work is devoted to the study of solar light that experiences single and
multiple scattering in the atmosphere at the twilight time. The work is based
on polarimetric observations of the twilight sky that were conducted in 1997
and 2000 for different color bands. Basing on the results of observations, the
contribution of single-scattered light depending on the wavelength for the
light stage of twilight is obtained. The correlation of color and polarization
properties of the twilight sky is investigated with an account of multiple
scattering
