Mesosphere light scattering depolarization during the Perseids activity epoch by wide-angle polarization camera measurements

• Wide-angle twilight sky polarization measurements during Perseids activity had conducted.
• Single scattering depolarization is observed close to maxima of tiny Perseids fraction.
• Altitude and polarization properties of dust in upper mesosphere are estimated.

The paper describes the study of scattered radiation field in the mesosphere basing on wide-angle polarization camera (WAPC) measurements of the twilight sky background and single scattering separation procedure. Mid-August observations in 2012 and 2013 show the decrease of single scattering polarization value probably related with Perseids meteor dust moderation in the upper mesosphere. Effect correlates with activity of tiny fraction of Perseids shower. Polarization and temperature analysis allows estimating the altitude of dust layer and character polarization of dust scattering.