Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247l.143y&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 247, Aug. 1, 1981, p. L143-L146.
Astronomy and Astrophysics
Astrophysics
11
Abundance, Cosmic Rays, Helium, Lunar Rocks, Solar Flares, Solar Wind, Spallation, Isotopes, Neon, Particle Collisions, Satellite Observation, Moon, Rocks, 68815, Samples, Lunar, Helium, Concentrations, Solar Wind, Spallation, Element Ratios, Cosmic Rays, Solar Flares, Abundance, Data, Neon, Flux
Scientific paper
Steep increases were detected in the concentration profiles of He-3 and possibly of Ne-21 in the near-surface layers of lunar rock 68815, which was exposed on the lunar surface for 2 Myr. The concentration profile of He-3 is inconsistent with either spallation or solar wind components, but it agrees with expected ranges of stopped solar flare particles. Although the He-3 retention in this rock is determined to be very low (approximately 3% at the surface), a long-term average solar flare ratio He-4/He-3 can be estimated at 12 to within a factor of about 3. This ratio is two orders of magnitude smaller than the same ratio observed in the solar wind, but it is consistent with solar flare data from recent satellite observations.
Marti Kurt
Yaniv Alon
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