Collecting a Sample of Solar Wind: An Experimental Study of Its Capture in Metal Films
作者:
D. Lal,
W. F. Libby,
G. Wetherill,
J. Leventhal,
G. D. Alton,
期刊:
Journal of Applied Physics
(AIP Available online 1969)
卷期:
Volume 40,
issue 8
页码: 3257-3267
ISSN:0021-8979
年代: 1969
DOI:10.1063/1.1658172
出版商: AIP
数据来源: AIP
摘要:
Foils of Al, Mg, Mo, Pt, Au, and MYLAR were bombarded with known fluxes of ions (3H,4He,22Ne,37Ar,85Kr), and accelerated to 1–40 keV in an electromagnetic isotope separator to determine the usefulness of a hypothetical experiment to bring home a sample of solar wind by exposing foils to the solar plasma current outside the earth's geomagnetic cavity. The amounts retained in such foils after bombardment and after subjecting them to particular heating cycles in vacuum and in air (1 atm) were determined. The problems of the loss of ions in space during the proposed space experiment and of extraction of ions in the laboratory subsequent to recovery were thus studied. Aluminum seems to be an acceptable collector material for solar‐wind ions. The trapping efficiency for other materials studied is variable and appreciably smaller than unity in some cases. However, since commercial aluminum can contain significant amounts of trapped rare gases, care must be taken to prepare the collector surfaces in their absence.
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