Journal
PLANETARY AND SPACE SCIENCE
Volume 189, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pss.2020.104970
Keywords
ASAN; Chang'E-4; ENA; Energy spectrum; Albedo
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Funding
- China National Space Administration
- Beijing Aerospace Control Center
- China Academy of Space Technology
- National Natural Science Foundation of China (NSFC) [41941001]
- Beijing Municipal Science and Technology Commission [181100002918003]
- Swedish National Space Agency (SNSA) [95/11]
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The Advanced Small Analyzer for Neutrals (ASAN) is an international payload onboard the Chinese Chang'E-4 rover. It performed for the first time measurements of energetic neutral atoms (ENAs) on the lunar surface. We show a typical mass separated ENA energy spectrum measured by the ASAN. After normalizing to the impinging solar wind proton energy, good agreement to previous measurements from Chandrayaan-1 and IBEX is found. The hydrogen ENA albedo is estimated to be 32% for energy above 30 eV, comparable to the estimates obtained from Chandrayaan-1 and IBEX. Particle fluxes at lower energies are generally higher than those observed by Chandrayaan-1 and IBEX, and possible reasons are discussed.
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