Scattering of light by mineral-dust particles much larger
than the wavelength
T. Nousiainen*,1, O. Muñoz2, H. Lindqvist1, P. Mauno1 and G. Videen3
- 1 Department of Physics, P.O. box 48, FI-00014 University of Helsinki, Finland.
- 2 Instituto de Astrofísica de Andalucía CSIC, c/ Camino Bajo de Huétor 50, 18080 Granada, Spain.
- 3 Army Research Laboratory, 2800 Powder Mill Road, Adelphi, MD 20783, USA.
We use a modified ray-optics code RODS (Ray Optics with Diffuse and Specular interactions) and laboratory-measured Mueller matrices to study light scattering by dust particles much larger than the wavelength. The rough-surface treatment of the RODS model allows us to reproduce the measured scattering matrices very well, except for the phase function. Surface roughness is found to decrease the asymmetry parameter and increase the single-particle albedo.
- * Corresponding author