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    Scattering and Absorption Properties of Polydisperse Wavelength-sized Particles Covered with Much Smaller Grains (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Using the results of direct, numerically exact computer solutions of the Maxwell equations, we analyze scattering and absorption characteristics of polydisperse compound particles in the form of wavelength-sized spheres covered with a large number of much smaller spherical grains.The results pertain to the complex refractive indices1.55 + i0.0003,1.55 + i0.3, and 3 + i0.1. We show that the optical effects of dusting wavelength-sized hosts by microscopic grains can vary depending on the number and size of the grains as well as on the complex refractive index. Our computations also demonstrate the high efficiency of the new superposition T-matrix code developed for use on distributed memory computer clusters.
    Keywords: Optics
    Type: GSFC-E-DAA-TN8900 , Journal of Quantitative Spectroscopy and Radiative Transfer; 113; 18; 2351-2355
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Adhesion of Mineral and Soot Aerosols can Strongly Affect their Scattering and Absorption Properties (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: We use the numerically exact superposition T-matrix method to compute the optical cross sections and the Stokes scattering matrix for polydisperse mineral aerosols (modeled as homogeneous spheres) covered with a large number of much smaller soot particles. These results are compared with the Lorenz-Mie results for a uniform external mixture of mineral and soot aerosols. We show that the effect of soot particles adhering to large mineral particles can be to change the extinction and scattering cross sections and the asymmetry parameter quite substantially. The effect on the phase function and degree of linear polarization can be equally significant.
    Keywords: Meteorology and Climatology
    Type: GSFC-E-DAA-TN8846 , Optics Letters; o 37; 4; 704-706
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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