1,1,- 1Swedish Institute of Space Physics, SSPT, Kiruna, Sweden (wieser@irf.se)
- 2National Space Science Center, Chinese Academy of Sciences, No.1 Nanertiao, Zhongguancun, Haidian district, Beijing, 100190, China
- 3University of Chinese Academy of Sciences, No. 1 Yanqihu East Road, Huairou district, Beijing, 101408, China.
Solar wind protons precipitating onto the lunar regolith forget their initial charge state when interacting with the surface. Subsequently particles are partially reemitted to space with a charge state distribution determined by the lunar regolith. Recent measurements on the lunar surface by the NILS instrument[1] on Chang’e-6 and the ASAN instrument[2] on Chang’e-4, both combined with Artemis data[3] allow to investigate the full charge state distribution of emitted hydrogen energies above ~10eV. We present energy dependent charge state fractions for backscattered and sputtered hydrogen and explore the fate of the emitted particle populations in the near lunar environment.
[1] R. Canu-Blot, et al. (2025), The Negative Ions at the Lunar Surface (NILS) Instrument on the Chang’E-6 Mission. Space Science Reviews, doi:10.1007/s11214-025-01162-w
[2] M. Wieser, et al. (2020), The Advanced Small Analyzer for Neutrals (ASAN) on the Chang’E-4 Rover Yutu-2. Space Science Reviews, doi:10.1007/s11214-020-00691-w
[3] C. Lue, et al.,(2018), Artemis observations of solar wind proton scattering off the lunar surface. Journal of Geophysical Research: Space Physics, doi:10.1029/2018JA025486
How to cite: Wieser, M., Canu-Blot, R., Barabash, S., Stenberg Wieser, G., Zhang, A., Wang, W., and Wang, C.: Charge exchange of solar wind protons precipitating on lunar regolith and the effect on the near lunar plasma environment, EPSC-DPS Joint Meeting 2025, Helsinki, Finland, 7–12 Sep 2025, EPSC-DPS2025-510, https://doi.org/10.5194/epsc-dps2025-510, 2025.
