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Deuterium and Helium-3 in the Protosolar Cloud

Published online by Cambridge University Press:  25 May 2016

George Gloeckler  and
Johannes Geiss
George Gloeckler
Affiliation:
Department of Physics and IPST, University of Maryland, College Park, Maryland 20742, and Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA
Johannes Geiss
Affiliation:
International Space Science Institute, Hallerstrasse 6, CH-3012 Bern, Switzerland

Abstract

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New measurements of the isotopic composition of helium in the solar wind obtained from the Solar Wind Ion Composition Spectrometer (SWICS) on Ulysses are presented and compared with earlier SWICS results and previous mass spectrometric determinations of this ratio with the Apollo Solar Wind Composition (SWC) experiment and the Ion Composition Instrument (ICI) on the International Sun Earth Explorer 3 (ISEE 3). The new SWICS data from both the fast and slow solar wind are extrapolated to the photosphere to obtain a representative value of the present-day ratio of 3He/4He = (3.75 ± 0.27) × 10−4 in the Outer Convective Zone (OCZ) of the Sun. After corrections of this ratio for secular changes caused by diffusion, mixing and 3He production by incomplete H-burning (Vauclair 1998), we obtain (D + 3He)/H = (3.6 ± 0.38) × 10−5 for the Protosolar Cloud (PSC). Adopting the Jovian 3He/4He ratio = (1.66 ±0.05) × 10−4 measured by the Galileo Probe mass spectrometer (Mahaffy et al. 1998) as representative for the PSC, we obtain (D/H)protosolar = (1.94 ±0.39) × 10−5. Using results of galactic evolution studies (Tosi 1998, 2000) and the D and 3He abundances in the Protosolar Cloud and the Local Interstellar Cloud (Linsky 1998; Gloeckler &Geiss 1998), we estimate (D/H)primordial = (2.4 − 4.2) × 10−5. This range corresponds to a universal baryon/photon ratio of (5.9−4.2) × 10−10.

Type
3. Abundances of D, 3He and 4He
Information
Symposium - International Astronomical Union , Volume 198: The Light Elements and their Evolution , 2000 , pp. 224 - 233
Copyright
Copyright © Astronomical Society of the Pacific 2000 

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