Abstract
Backscattering of light by hexagonal ice columns and plates has been calculated by means of a ray-tracing code. A gigantic peak of backscattering is found at the angle of about 32.5 degrees between the principal axis of a particle and incidence direction for both hexagonal ice columns and plates. This peak is explained by multiple total internal reflections inside the crystals that take place for a part of incident rays. The obtained results on backscattering efficiency allow somebody to calculate backscattering by an ensemble of the hexagonal ice cylinders of various sizes, shapes and orientations. Backscattering Mueller matrix has been calculated, too. Slant lidar remote sensing of cirrus clouds for discrimination between aligned columns and plates is suggested as an application of the results obtained.
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