Implanted solar helium, neon, and argon in individual lunar ilmenite grains - Surface effects and a temporal variation in the solar wind composition

Details Implanted solar helium, neon, and argon in individual lunar ilmenite grains - Surface effects and a temporal variation in the solar wind composition Implanted solar helium, neon, and argon in individual lunar ilmenite grains - Surface effects and a temporal variation in the solar wind composition

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.1031n&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 58, p. 1031

Other

9

Solar Corpuscular Radiation, Rare Gases, Lunar Soil, Solar Wind, Plasma Composition, Neon, Helium, Argon

Scientific paper

Solar implanted He, Ne, and Ar were extracted from individual ilmenite grains from lunar soil 71501 and soil breccia 79035, using laser vaporization and analyzed by static mass spectrometry. Clear differences were observed for these two grain populations, one from a contemporary soil and the other from an ancient soil exposed on the lunar surface approximately 1 Ga ago. The different trends between the Ne-20/Ne-22 ratios and the He/Ne ratios do not simply reflect differences either in regolith gardening or in diffusive losses but rather suggest a greater relative He abundance in the ancient solar wind by a factor of about 1.8. The majority of the grains are enriched in solar energetic particle (SEP) Ne relative to solar wind (SW) Ne in a manner that increases with surface exposure. The progressive enrichment in retained SEP Ne relative to SW Ne is explained by a combination of diffusion and nonfractionating losses of the less deeply implanted SW component. The Ne isotopic differences observed in various analyses of ilmenite separates from these two soils may be a natural consequence of greater SW losses which accompany an enhanced He flux in the ancient solar wind.

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