Polarization properties of the coherent backscattering enhancement for large nonspherical particles with random orientation
A.V. Konoshonkin1,2, N.V. Kustova1, V.A. Shishko1,2, D.N. Timofeev1, N. Kan1, I.V. Tkachev1, K.S. Salnikov2, A.G. Borovoi1
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
2National Research Tomsk State University, Tomsk, Russia
Keywords: light scattering, physical optics method, atmospheric ice crystals, cirrus clouds
Abstract
The polarization elements of the light scattering matrix in the vicinity of the backscattering direction of a perfect hexagonal column and a particle of a random convex polyhedral shape are studied within the physical optics approximation. The study was carried out for particles with a size of 10-100 microns for a wavelength of 0.532 microns. It is shown that, within the vicinity of the coherent backscattering peak, the polarization elements of the matrix have significant local extrema. At the same time, their angular width practically does not depend on the shape of the particle, but significantly depends on the size. The results are of interest for the interpretation of lidar measurements in cirrus clouds.
|
