[P-PS09] Lunar Science and Exploration

[PPS09-P21] Preliminary results of the application of the numerical model of photo-emitted electrons to the analysis of environments near the surface of the Moon

*Masahisa Kato¹, Yuki Harada¹, Masaki N Nishino², Yoshifumi Saito², Shoichiro Yokota³, Futoshi Takahashi⁴, Hisayoshi Shimizu⁵, Shaosui Xu⁶, Andrew R Poppe⁶, Jasper S Halekas⁷ (1.Kyoto University, 2.JAXA, 3.Osaka University, 4.Kyushu University, 5.University of Tokyo, 6.University of California, Berkeley, 7.University of Iowa)

The surface of airless bodies interacts with its ambient plasma. The interactions can change the environment of the airless bodies, and lunar surface charging is an example of such environmental changes. Kato et al. (2023) developed a numerical model of photo-emitted electron energy spectra and compared the model with the observed spectra. To investigate the electrostatic environment of the Moon, we utilize the photo-emitted electrons emitted from the lunar surface. In this study, we analyze electron observations by Kaguya and THEMIS-ARTEMIS probes in comparison with our numerical model to reveal what parameters play an important role in changing the lunar electrostatic environment. We also discuss the desired energy resolution of the electron measurements to obtain more detailed information on the lunar surface.