Light Scattering by Aggregate Particles Comparable in Size to Wavelength: Application to Cometary Dust

Details Light Scattering by Aggregate Particles Comparable in Size to Wavelength: Application to Cometary Dust Light Scattering by Aggregate Particles Comparable in Size to Wavelength: Application to Cometary Dust

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001sosyr..35...57p&link_type=abstract

Solar System Research, v. 35, Issue 1, p. 57-69 (2001).

Computer Science

7

Scientific paper

Many naturally occurring particles (including, most likely, cometary dust) have an aggregate structure. We study the scattering properties of polydisperse independent aggregate particles (clusters) comparable in size to visible wavelengths. The sizes of the monomers constituting a cluster play a significant role in forming the angular dependences of intensity and linear polarization of the scattered light. Irregularly structured aggregates composed of a moderate number of spheres (<50) with size parameters 1.3-1.65 exhibit properties typical of cometary dust particles: a slight increase in backscattering intensity, a negative polarization at small phase angles, an inversion phase angle close to the observed one, an increase in brightness, and a linear polarization with increasing wavelength. In this case, the imaginary part of the refractive index for particles can increase with decreasing wavelength in the visible spectral range, which is typical of silicates with an admixture of iron or organic material. The spectral dependence of extinction efficiency for aggregates is less steep than that for equivalent spherical particles, and its maximum is shifted to larger size parameters. Therefore, when analyzing extinction measurements, the scatterer shape must be taken into account to avoid underestimation of the scattering-particle sizes.

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