Constraints on Neon and Argon Isotopic Fractionation in Solar Wind-Reference-Cited by-同舟云学术

Constraints on Neon and Argon Isotopic Fractionation in Solar Wind

Published:2007-10-19 Issue:5849 Volume:318 Page:433-435
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Meshik Alex¹²³⁴⁵,Mabry Jennifer¹²³⁴⁵,Hohenberg Charles¹²³⁴⁵,Marrocchi Yves¹²³⁴⁵,Pravdivtseva Olga¹²³⁴⁵,Burnett Donald¹²³⁴⁵,Olinger Chad¹²³⁴⁵,Wiens Roger¹²³⁴⁵,Reisenfeld Dan¹²³⁴⁵,Allton Judith¹²³⁴⁵,McNamara Karen¹²³⁴⁵,Stansbery Eileen¹²³⁴⁵,Jurewicz Amy J. G.¹²³⁴⁵

Affiliation:

1. Physics Department, Washington University, St. Louis, MO 63130, USA.

2. Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA.

3. Neutron Science and Technology, MS H803, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.

4. Space Science and Applications, MS D466, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.

5. Physics and Astronomy Department, University of Montana, SC 121, 32 Campus Drive, MS 1080, Missoula, MT 59812, USA.

Abstract

To evaluate the isotopic composition of the solar nebula from which the planets formed, the relation between isotopes measured in the solar wind and on the Sun's surface needs to be known. The Genesis Discovery mission returned independent samples of three types of solar wind produced by different solar processes that provide a check on possible isotopic variations, or fractionation, between the solar-wind and solar-surface material. At a high level of precision, we observed no significant inter-regime differences in 20 Ne/ 22 Ne or 36 Ar/ 38 Ar values. For 20 Ne/ 22 Ne, the difference between low- and high-speed wind components is 0.24 ± 0.37%; for 36 Ar/ 38 Ar, it is 0.11 ± 0.26%. Our measured 36 Ar/ 38 Ar ratio in the solar wind of 5.501 ± 0.005 is 3.42 ± 0.09% higher than that of the terrestrial atmosphere, which may reflect atmospheric losses early in Earth's history.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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