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Scattering And Absorption of Light in Planetary Regoliths

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Scattering of light by large nonspherical particles: ray-tracing approximation versus T-matrix method.

A Macke, M I Mishchenko, K Muinonen

|October 29, 2009

Summary

Geometric-optics approximation accurately models light scattering for large spheroids, outperforming spheres. This method is reliable for phase function calculations, even for smaller particles, with minimal impact on single-scattering albedo.

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Area of Science:

Atmospheric Optics
Computational Physics
Radiative Transfer Theory

Background:

Accurate light-scattering computations are crucial for understanding atmospheric radiative transfer.
Nonspherical particles significantly influence light scattering properties in the atmosphere.
Evaluating approximations against exact methods is essential for computational efficiency.

Purpose of the Study:

To compare light-scattering computations for spheroids using geometric-optics approximation and the T-matrix method.
To assess the accuracy of the geometric-optics approximation for nonspherical particles.
To determine the applicability of the geometric-optics approximation for various scattering parameters.

Main Methods:

Light-scattering computations for randomly oriented, moderately absorbing spheroids.
Comparison between geometric-optics approximation and the exact T-matrix method.
Analysis of phase function and polarization computations.

Main Results:

Geometric-optics approximation shows higher accuracy for spheroids than for spheres.
The approximation is suitable for phase function computations with size parameters as low as 60.
Differences in single-scattering albedo between methods are minimal, even for small size parameters.

Conclusions:

The geometric-optics approximation is a viable and accurate tool for light-scattering phase function computations of spheroids.
The method's limitations exist for polarization computations.
Findings support the use of geometric-optics approximation for efficient modeling of atmospheric light scattering by nonspherical particles.