Calculating Rayleigh scattering from particulate surfaces and saturn's rings

Area of Science:

• Planetary Science
• Astrophysics
• Optics

Background:

• Light scattering from rough particulate surfaces, like asteroids, provides crucial data on surface structure and optical properties.
• Previous models successfully calculated light scattering for particles larger than the wavelength of light using Fresnel's equation and geometrical optics.

Purpose of the Study:

• To extend light scattering calculations to include small particle scattering processes, specifically Rayleigh scattering.
• To investigate the impact of mixed Rayleigh and Fresnel scattering on photopolarimetric measurements.

Main Methods:

• Extended existing light scattering calculations to incorporate Rayleigh and other small particle scattering regimes.
• Analyzed the effects of these scattering processes on photopolarimetric measurements, focusing on inversion angle and polarization plots.

Main Results:

• Small amounts of Rayleigh scattering significantly alter photopolarimetric signatures when mixed with Fresnel scattering.
• Observed changes in single and double scattering events at the inversion angle and modifications to the negative branches of polarization plots.

Conclusions:

• The inclusion of small particle scattering provides a more comprehensive understanding of light interaction with particulate surfaces.
• These refined calculations are valuable for remote sensing applications, particularly for characterizing the soils of asteroids and outer planets.