Light scattering by porous volcanic ash particles
H. Lindqvist*,1, T. Nousiainen1, E. Zubko1 and O. Muñoz3
- 1 Department of Physics, University of Helsinki, P.O. Box 48, FI-00014 Finland.
- 2 Instituto de Astrofísica de Andalucía CSIC, c/ Camino Bajo de Huétor 50, 18080 Granada, Spain.
Single-scattering properties of volcanic ash particles are evaluated theoretically using a novel shape model for porous particles with cratery surfaces. Preliminary discrete-dipole approximation computations reveal that light scattering by the model particles produces large-scale features comparable to the measured properties of real volcanic ash particles. The effect of internal porosity is also investigated, and it turns out that internal porosity generally promotes positive polarization and decreases the depolarization ratio.
- * Corresponding author