Physics
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29..653b&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 5, p. 653-658
Physics
14
Chemical Composition, Fractionation, Lunar Rocks, Moon, Neon Isotopes, Nitrogen Isotopes, Solar Atmosphere, Solar Corpuscular Radiation, Solar Wind, Sun, Graphs (Charts), Samples, Solar Flares, Solar Physics, Tables (Data), Variations
Scientific paper
In a further step to assess processes leading to the complicated secular trend of the isotopic composition of N implanted in lunar regolith, we investigate mechanisms fractionating solar energetic particles (SEPs). We conclude that such mechanisms are likely to occur, most probably producing an enrichment of N-15 over N-14 in SEPs over the photospheric abundance ratio. Simultaneously, Ne-22 is enriched over Ne-20 but to a lesser extent. An enrichment of the heavy Ne isotope is observed in the suprathermal solar particles, implanted in the lunar regolith. Hence, the now well-established difference between the isotopic composition of suprathermal Ne and solar wind Ne in the lunar regolith might be taken as evidence for the validity of this model. The present-day fluxes of energetic particles produced in impulsive flare events, capable to produce such isotopic fractionations are, however, orders of magnitude below the required amounts to explain the lunar observations. The details of the secular variation of the N isotopic composition remain an enigma.
Bochsler Peter
Kallenbach Reinald
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