Physics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.4293m&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 23, p. 4293-4296
Physics
5
Interplanetary Physics: Energetic Particles, Solar, Interplanetary Physics: Sources Of The Solar Wind, Planetology: Solar System Objects: Moon, Magnetospheric Physics: Solar Wind Interactions With Unmagnetized Bodies
Scientific paper
Stepwise etching of lunar soil ilmenite grains reveals that the 15N/14N ratio of implanted nitrogen decreases with increasing implantation depth within the ilmenite grains, i.e., with increasing energy of implantation. These results show that N derived from solar energetic particles, NSEP, is enriched in the light isotope, 14N, relative to solar-wind nitrogen, NSW. This is in striking contrast to the neon isotopic record: NeSEP is depleted in the light isotope, 20Ne, relative to NeSW. These data suggest either distinct signatures in the respective solar source regions, or fractionation in the acceleration mechanism(s). However, the observed opposite fractionation trends for light N and Ne isotopes do not agree with model predictions.
Kerridge John F.
Marti Kurt
Mathew K. J.
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