Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975moon...14..169m&link_type=abstract
(Lunar Science Institute, Conference on Interactions of the Interplanetary Plasma with the Modern and Ancient Moon, Lake Geneva,
Astronomy and Astrophysics
Astronomy
6
Atmospheric Composition, Lunar Atmosphere, Lunar Evolution, Plasma Interactions, Solar Wind, Cosmic Rays, Degassing, Gas Mixtures, High Energy Interactions, Mass Spectroscopy, Meteorite Collisions, Trapped Particles
Scientific paper
The nature and composition of the lunar atmosphere are examined on the basis of solar-wind interactions, and the nature of the species in the trapped-gas layer is discussed using results of theoretical and experimental investigations. It is shown that the moon has a highly tenuous atmosphere consisting of various species derived from five sources: solar-wind interaction products, cosmic-ray interaction products, effects of meteoritic impacts, planetary degassing, and radioactive-decay products. Atmospheric concentrations are determined for those species derived from solar-wind protons, alpha particles, and oxygen ions. Carbon chemistry is briefly discussed, and difficulties encountered in attempts to determine quantitatively the concentrations of molecular oxygen, atomic oxygen, carbon monoxide, carbon dioxide, and methane are noted. The calculated concentrations are shown to be in good agreement with observations by the Apollo 17 lunar-surface mass spectrometer and orbital UV spectrometer.
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