Аннотация:In this study we have examined spectral trends of Reiner Gamma (7.5°N, 59°W) using the Moon
Mineralogy Mapper (M3) observations. We derived maps of solar wind induced OH/H2O and a
compaction index map of the Reiner Gamma swirl. Our results suggest that the combination of soil compaction and magnetic shielding can explain the observed spectral trends. These new findings support the hypothesis of swirl formation by interaction between a comet and the uppermost regolith layer.