Statistics – Applications
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006elsn.conf..187m&link_type=abstract
In: 9th International Conference on Electromagnetic and Light Scattering by Nonspherical Particles: Theory, Measurements, and Ap
Statistics
Applications
Polarization, Dust, Comets
Scientific paper
Dust grains in many astronomical environments are assumed to be aggregates of small particles with different sizes and compositions. In order to interpret observations of light scattered, emitted or absorbed by such composite particles, a method is required that takes the details of the particles into account. Since emission spectra of small particles are very sensitive to the shape, structure and composition of the particles, we need a method for computing the optical properties of inhomogeneous aggregates of irregularly shaped constituents. We propose a fast method to perform these computations based on the Discrete Dipole Approximation, using irregularly shaped dipoles for the aggregate constituents. Some results of computations for inhomogeneous aggregates of various sizes are presented. Possible implications of the resulting spectra for the interpretation of observations are briefly discussed.
Hovenier Joachim Willem
Min Maozhong
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