Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...507l.185k&link_type=abstract
The Astrophysical Journal, Volume 507, Issue 2, pp. L185-L188.
Astronomy and Astrophysics
Astronomy
30
Solar System: Formation, Sun: Solar Wind, Sun: Abundances
Scientific paper
Using the high-resolution Mass Time-of-Flight (MTOF) spectrometer of the Charge, Element, and Isotope Analysis System (CELIAS) experiment on board the Solar and Heliospheric Observatory (SOHO), we have determined the solar wind isotope abundance ratio ^14N/^15N = 200+/-55 (1 sigma error), suggesting that the relative abundance of ^15N in the terrestrial atmosphere is lower than in solar matter. This result is compatible with the hypothesis that terrestrial N (^14N/^15N = 272) and also N found in lunar surface material are a mixture of a heavy component that is identical to solar N and an unspecified light component. The large variations of ^14N/^15N in solar system matter is caused by special isotope enrichment processes, as in the case of Mars, as well as by varying contributions of isotopically different components.
Bochsler Peter
Geiss Johannes
Gliem Fritz
Gloeckler George
Hefti Simon
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