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First results of multi-wavelength measurements of the twilight sky backgroundusing all-sky camera with RGB-color CCD conducted in spring and summer of 2016in central Russia (55.2 deg N, 37.5 deg E) are discussed. They show the effectof aerosol scattering at altitudes up to 35 km which significantly increases tothe long-wave range (624 nm, R channel). Analysis of sky color behavior duringthe light period of twilight with account of ozone Chappuis absorption allowsretrieving the angle dependencies of scattering on the stratospheric aerosolparticles. This is used to find the parameters of lognormal size distribution:median radius about 0.08 microns and width 1.5-1.6 for stratospheric altituderange.

Background Stratospheric Aerosol Investigations Using Multi-Color Wide-Field Measurements of the Twilight Sky