Description
Chair: Antti Penttilä
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Anne Virkki (University of Helsinki)27/05/2026, 13:15Oral
In light of the renewed interest in landed missions to the Moon, here we empirically evaluate the effect of meter-scale rock-related roughness on radar backscatter by combining monostatic S-band (13 cm) radar measurements by the Lunar Reconnaissance Orbiter's (LRO) Miniature Radio Frequency (Mini-RF) instrument with Diviner-derived meter-scale rock abundance (RA) [1] over the lunar surface,...
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Karri Muinonen (University of Helsinki, Department of Physics)27/05/2026, 13:30Oral
A theoretical fractional-Brownian-motion particulate-medium scattering model (fBm-PM; see Björn et al., PSJ 5, 260, 2024) is used to interpret space-based and ground-based observations of Mercury regolith in the ultraviolet--visible--near-infrared spectral range of photometric and polarimetric observations. The fBm-PM model is based on radiative transfer and coherent backscattering (RT-CB) and...
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Ari Leppälä (University of Helsinki)27/05/2026, 13:45Oral
Airless Solar System objects’ photometric phase curves exhibit a distinctive opposition effect, marked by nonlinear brightening as phase angles approach the backscattering direction. In addition to phase angles below approximately 20 degrees, polarimetric phase curves predominantly show a negative degree of linear polarization, with scattered light polarized parallel to the Sun-object-observer...
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Meri Kolehmainen (University of Helsinki)27/05/2026, 14:00Oral
The irregular particulate surfaces of asteroids lead to complex light-scattering processes affected by multiple surface properties, such as particle size, shape, refractive index, and spatial distribution. When modelling the scattering processes, the single scatterers can be described with the scattering matrix, a 4x4 Mueller matrix [1]. However, inverse modelling of the surface properties...
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Mikko Vuori (University of Helsinki)27/05/2026, 14:15Oral
Sunlight that is scattered by a planetary surface is altered, meaning that asteroid regolith surfaces can be studied via light scattering.
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The regolith surface properties that contribute to light scattering are its material, particle shape, particle size, and size distribution. As an inverse problem, the same properties can be derived for the surface from scattered light. If one of the...