Applicability of the discrete-dipole approximation to light-scattering simulations of large cosmic dust aggregates

Details Applicability of the discrete-dipole approximation to light-scattering simulations of large cosmic dust aggregates Applicability of the discrete-dipole approximation to light-scattering simulations of large cosmic dust aggregates

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...448..395k&link_type=abstract

Astronomy and Astrophysics, Volume 448, Issue 1, March II 2006, pp.395-399

Astronomy and Astrophysics

Astrophysics

7

Scattering, Solar System: General, Circumstellar Matter, Dust, Extinction, Meteors, Meteoroids

Scientific paper

Light-scattering properties of cosmic dust particles depend on the structure and composition of the particles. A common model assumption of cosmic dust particles that is consistent with observational data is to describe them as aggregates consisting of irregularly shaped, inhomogeneous, submicron-sized monomers. It is necessary for a study of their optical properties to apply a proper light-scattering theory, in which we can fully take this shape and structure of particles into account. Among currently available light-scattering theories, the discrete-dipole approximation (DDA) with the lattice dispersion relation (LDR) is the best method to simulate light scattering by aggregates of such complex structures. We investigate the accuracy of the LDR-DDA method with large aggregates consisting of spherically shaped, homogeneous, identical monomers of 0.1 μm in radius, for which rigorous solutions are known. The asymmetry parameter and single-scattering albedo of these aggregates are here computed with the LDR-DDA method as well as the superposition T-matrix method. We find that the conditions previously given in the literature to calculate cross sections of spherical particles within the accuracy of a few percent are also suitable for large aggregates. We discuss the required computer memory that restricts simulating the optical properties of the considered aggregates.

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