Other
Scientific paper
Mar 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000m%26ps...35..251w&link_type=abstract
Meteoritics & Planetary Science, vol. 35, no. 2, pp. 251-257 (2000).
Other
13
Scientific paper
We present Ne data from plagioclase separates from the solar noble gas-rich meteorite Kapoeta, obtained mainly by in-vacuo etching. Samples rich in solar gases contain an excess of cosmogenic Ne compared to solar gas-poor samples, testifying to an exposure to cosmic rays in the parent body regolith. The 21Ne/22Ne ratio of the excess component is slightly lower than that of the Ne acquired during the meteoroid flight. Model calculations indicate that the observed isotopic composition of the excess Ne can be produced by galactic cosmic rays at a reasonable mean shielding of around a hundred to a few hundred g/cm2. No substantial contribution from Ne produced by solar cosmic rays is needed to explain the data. We therefore conclude that they do not offer evidence for a substantially enhanced flux of solar energetic particles early in solar history, contrary to other claims. This conclusion is in agreement with solar flare track data.
Leya Ingo
Pedroni Anselmo
Wieler Rainer
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