Rigorous light-scattering simulations of nanophase iron space-weathering effects on reflectance spectra of olivine grains

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http://hdl.handle.net/10138/316685

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Penttilä , A , Väisänen , T , Markkanen , J , Martikainen , J , Kohout , T , Videen , G & Muinonen , K 2020 , ' Rigorous light-scattering simulations of nanophase iron space-weathering effects on reflectance spectra of olivine grains ' , Icarus , vol. 345 , 113727 . https://doi.org/10.1016/j.icarus.2020.113727

Title: Rigorous light-scattering simulations of nanophase iron space-weathering effects on reflectance spectra of olivine grains
Author: Penttilä, Antti; Väisänen, Timo; Markkanen, Johannes; Martikainen, Julia; Kohout, Tomas; Videen, Gorden; Muinonen, Karri
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Planetary-system research
University of Helsinki, Department of Physics
University of Helsinki, Department of Geosciences and Geography
University of Helsinki, Department of Physics
Date: 2020-07-15
Language: eng
Number of pages: 8
Belongs to series: Icarus
ISSN: 0019-1035
URI: http://hdl.handle.net/10138/316685
Abstract: We present a multi-scale light-scattering model that is capable of simulating the reflectance spectra of a regolith layer. In particular, the model can be applied to a case where the regolith grains have varying amounts of nanophase inclusions due to space weathering of the material. As different simulation tools are employed for different size scales of the target geometry (roughly, nano-, micro-, and millimeter scales), the particle size effects, the surface reflections, and the volume scattering can all be properly accounted for. Our results with olivine grains and nanophase iron inclusions verify the role of the nanoinclusions in the reflectance spectra of space-weathered materials. Together with the simulation results, we give simplified explanations for the space-weathering effects based on light scattering, namely the decrease of albedo, the general increase of the red spectral slope, and the dampening of the spectral bands. We also consider the so-called ultraviolet bluing effect, and show how the change in the spectral slope over the ultraviolet-visual wavelengths is due to the decrease of reflectance in the visual wavelengths rather than the increase of reflectance in the ultraviolet part.
Subject: ABSORPTION
ASTEROIDS
Asteroids
DISCRETE RANDOM-MEDIA
LASER IRRADIATION EXPERIMENTS
MERCURY
NANOPARTICLES
PARTICLES
RAY OPTICS
Regoliths
Spectroscopy
The moon
WAVELENGTHS
115 Astronomy, Space science
114 Physical sciences
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