What has caused the secular increase in solar nitrogen-15?

Details What has caused the secular increase in solar nitrogen-15? What has caused the secular increase in solar nitrogen-15?

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989sci...245..480k&link_type=abstract

Science (ISSN 0036-8075), vol. 245, Aug. 4, 1989, p. 480-486.

Computer Science

29

Abundance, Nitrogen 15, Secular Variations, Solar Wind, Lunar Composition, Lunar Soil, Solar Neutrinos, Solar Planetary Interactions, Stellar Composition

Scientific paper

While the N-15/N-14 ratio variations noted in lunar surface samples appear to be due to a secular increase in this ratio in the solar wind, over a period of several billion years, whose ultimate cause may be found in the solar convective zone, the change resists explanation within the currently accepted framework of solar processes. A 'mixing model' approach is presently invoked which implies that the isotopic composition of each component has remained constant over time, thereby obviating the postulation of the large change in composition of so large an isotopic reservoir as the solar convective zone. An evaluation is made of the drawbacks of this approach.

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