Solar Krypton and Xenon in gas-rich meteorites: New insights into a unique archive of solar wind

Details Solar Krypton and Xenon in gas-rich meteorites: New insights into a unique archive of solar wind Solar Krypton and Xenon in gas-rich meteorites: New insights into a unique archive of solar wind

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..598..387h&link_type=abstract

SOLAR AND GALACTIC COMPOSITION: A Joint SOHO/ACE Workshop. AIP Conference Proceedings, Volume 598, pp. 387-392 (2001).

Computer Science

4

Heliopause And Solar Wind Termination, Composition

Scientific paper

We present elemental and isotopic ratios of Ar, Kr, and Xe implanted by the solar wind in different gas-rich regolithic meteorites. The noble gases were released by closed system stepwise etching with HF, which allows us to separate the solar from the primordial noble gases, at least in the first steps. The 36Ar/84Kr ratios of Noblesville and Fayetteville lie in the range of unfractionated bulk solar values. The rather constant 36Ar/84Kr ratio in Pesyanoe is about 40-50% lower than bulk solar values and in the range of solar wind values measured in lunar samples. In contrast, the 84Kr/132Xe ratio of all measured meteorites as well as all lunar samples is several times lower than the inferred bulk solar values. This Xe enhancement in the solar wind appears to be a result of the ``FIP effect'' or related processes in the solar wind source region, which leads to an enrichment of elements with a low first ionization potential. The meteorite data presented here show that the Xe and Kr abundances in the solar wind in the past were more variable than indicated by lunar samples alone. The ``FIP-effect'' may have existed since 4 Ga ago or even earlier. .

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