VIS-NIR/SWIR Spectral Properties of H2O Ice Depending on Particle Size and Surface Temperature

Laboratory measurements were performed to study the spectral signature of H2O ice between 0.4 and 4.2 µm depending on varying temperatures 70 220 K. Spectral parameters samples with particle sizes up ~1360 µm, size mixtures, different shapes analyzed. The band depth (BD) major H2O-ice absorptions at 1.04, 1.25, 1.5, 2 offers an excellent indicator for in pure ice. changes due temperature rather, but not exclusively, affect located 1.31, 1.57, 1.65 Fresnel reflection peaks 3.1 3.2 which strongly weaken increasing temperature. As BDs increase, centers (BCs) 1.25 1.5 slightly shift shorter wavelengths. However, BCs strong can also be affected by saturation case large particles. collected spectra provide a useful library future investigations icy satellites such as Ganymede Callisto, targets ESA’s JUICE mission.