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Keywords
(9)
Approximate Solution
Complex Objects
Exact Computation
Light Scattering
Maxwell Equation
Near Field
Radiative Transfer
Refractive Index
Weak Localization
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Light scattering by morphologically complex objects and opposition effects (a review)
Light scattering by morphologically complex objects and opposition effects (a review),10.1134/S0038094611030038,Solar System Research,E. V. Petrova,V.
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Light scattering by morphologically complex objects and opposition effects (a review)
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E. V. Petrova
,
V. P. Tishkovets
Over the last decade, considerable progress has been achieved in the theory of
light scattering
by morphologically complex objects, which extends the potential of correct interpretation of photometric and polarimetric observations. This especially concerns the backscattering domain, where the opposition effects in brightness and polarization are observed. Although the equations of
radiative transfer
and
weak localization
(coherent backscattering) are rigorously valid only for sparse media, the results of exact computer solutions of the Maxwell equations for a macroscopic volume filled with randomly positioned particles show that their application area can be wider. In particular, the observations can be correctly interpreted if the packing density of particles in the medium reaches 20–30%. The recently suggested
approximate solution
of the coherent backscattering problem allowed interesting effects in the spectra of Saturn’s satellites to be explained. In the densely packed media, the effects that are impossible in the sparse media and caused by the nearfield contribution can be observed. To calculate the characteristics of radiation reflected by such a medium, it is not sufficient to solve the
radiative transfer
and
weak localization
equations, even if they are written in a form without the farzone limitations. Nowadays, the influence of the interaction of particles in the
near field
can be analyzed only for the restricted ensembles of particles. It shows that the substantial increase of the packing density essentially changes the phase functions of intensity and polarization in the backscattering domain. This allows the packing density of particles in the medium and their absorbing properties to be estimated from the shape of the phase curves measured. However, the task of quantitative interpretation of the measurements of radiation reflected by a densely packed medium, in terms of sizes of particles, their refractive index, and packing density, still remains unsolved.
Journal:
Solar System Research  SOLAR SYST RES
, vol. 45, no. 4, pp. 304322, 2011
DOI:
10.1134/S0038094611030038
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