クレメンタインUVVISデータによる月の海の地質解析

抄録

Distribution of FeO and Ti0₂contents on the lunar surface was mapped by using Clementine UVVIS data in the following sequence. (1) The data was radiometically calibrated. (2) An image map of a large area was created by mosaicking images in one orbit and then between neighboring orbits. (3) The maturity effect was removed by using VIS reflectance data and ratio of NIR to VIS in order to obtain the FeO content parameter. (4) FeO content was derived by comparing the FeO parameter and FeO content that was actually measured for the returned samples by chemical analysis. This method was also applied to estimate Ti0₂ content with UV reflectance data and UV/VIS ratio. False color composite images were generated by assigning brightness, in addition to FeO and Ti0₂ contents, to the three primitive colors. We applied this method to two typical lunar maria; Mare Serenitatis and Mare Moscovience, and investigated lunar surface lithologies and geologic histories of these regions.