Multiband Spectropolarimetry of Lunar Maria, Pyroclastics, Fresh Craters, and Swirl Materials

Multiband Spectropolarimetry of Lunar Maria, Pyroclastics, Fresh Craters, and Swirl Materials

Blog Article

Imaging polarimetry is a well-known method for examining the small-scale structure of the surface regolith of airless celestial bodies.In this study, we examine (for the first time) the wavelength-dependent polarization behavior of selected lunar areas, including maria, highlands, fresh craters, pyroclastic deposits, and the Reiner Gamma swirl, based on telescopic multiband UBVRI i want choo 60ml imaging polarimetry at phase angles within the range of the positive polarization branch.The terrain-dependent spectropolarimetric behavior is studied for the first time in this work.

For each study area, we conduct a mapping of the relative regolith grain size, an analysis of the exponent of the Umov law, and the wavelength dependence of the degree of linear polarization.Furthermore, we perform area-specific principal component analyses of the degree of linear polarization, followed by unsupervised machine learning (clustering) to segment different terrain types.We find that fresh mare craters and high-titanium pyroclastic deposits have an increased regolith grain size, whereas crater ray material, low-titanium pyroclastic material, and the Reiner Gamma swirl are more finely grained than the average regolith.

The degree of linear polarization decreases with increasing wavelength-dependent albedo according to a power law whose exponent is itself positively correlated with the albedo.For a constant albedo and grain size, the degree of linear polarization increases linearly with wavelength.The clustering step yields a library of terrain-dependent prototype spectra of the lycogel degree and angle of linear polarization.