[P-PS09] 月の科学と探査

[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

*加藤 正久¹、原田 裕己¹、西野 真木²、斎藤 義文²、横田 勝一郎³、高橋 太⁴、清水 久芳⁵、Shaosui Xu⁶、Andrew Poppe⁶、Jasper Halekas⁷ (1.京都大学、2.JAXA、3.大阪大学、4.九州大学、5.東京大学、6.カリフォルニア大学バークレー校、7.アイオワ大学)

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.