Isotopic Composition of H,HE and NE in the Protosolar Cloud |
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Authors: | Geiss Johannes Gloeckler George |
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Institution: | (1) International Space Science Institute, Hallerstrasse 6, 3012 Bern, Switzerland;(2) Dept. of Physics and IPST, University of Maryland, College Park, MD 20742, USA;(3) University of Michigan, Ann Arbor, MI 48109, USA |
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Abstract: | Observations and measurements in the solar wind, the Jovian atmosphere and the gases trapped in lunar surface material provide
the main evidence from which the isotopic composition of H, He and Ne in the Protosolar Cloud (PSC) is derived. These measurements
and observations are reviewed and the corrections are discussed that are needed for obtaining from them the PSC isotopic ratios.
The D/H, 3He/4He (D+3He)/H, 20Ne/22Ne and 21Ne/22Ne ratios adopted for the PSC are presented. Protosolar abundances provide the basis for the interpretation of isotopic ratios
measured in the various solar system objects. In this article we discuss constraints derived from the PSC abundances on solar
mixing, the origin of atmospheric neon, and the nature of the “SEP” component of neon trapped at the lunar surface. We also
discuss constraints on the galactic evolution provided by the isotopic abundances of H and He in the PSC.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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