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Cool heliosheath plasma and deceleration of the upstream solar wind at the termination shock
Richardson, J. D.; Kasper, J. C.; Wang, C.; Belcher, J. W.; Lazarus, A. J.; 北京8701信箱
Department空间天气学国家重点实验室
Source PublicationNature
2008
Volume454Issue:7200Pages:63-66
ISSN0028-0836
Language英语
KeywordInterstellar Magnetic-field Neutral Hydrogen Perpendicular Shocks Voyager-1
AbstractThe solar wind blows outward from the Sun and forms a bubble of solar material in the interstellar medium. The termination shock occurs where the solar wind changes from being supersonic ( with respect to the surrounding interstellar medium) to being subsonic. The shock was crossed by Voyager 1 at a heliocentric radius of 94 AU ( 1 AU is the Earth - Sun distance) in December 2004 ( refs 1 - 3). The Voyager 2 plasma experiment observed a decrease in solar wind speed commencing on about 9 June 2007, which culminated in several crossings of the termination shock between 30 August and 1 September 2007 ( refs 4 - 7). Since then, Voyager 2 has remained in the heliosheath, the region of shocked solar wind. Here we report observations of plasma at and near the termination shock and in the heliosheath. The heliosphere is asymmetric, pushed inward in the Voyager 2 direction relative to the Voyager 1 direction. The termination shock is a weak, quasi- perpendicular shock that heats the thermal plasma very little. An unexpected finding is that the flow is still supersonic with respect to the thermal ions downstream of the termination shock. Most of the solar wind energy is transferred to the pickup ions or other energetic particles both upstream of and at the termination shock.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/1090
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
Richardson, J. D.,Kasper, J. C.,Wang, C.,et al. Cool heliosheath plasma and deceleration of the upstream solar wind at the termination shock[J]. Nature,2008,454(7200):63-66.
APA Richardson, J. D.,Kasper, J. C.,Wang, C.,Belcher, J. W.,Lazarus, A. J.,&北京8701信箱.(2008).Cool heliosheath plasma and deceleration of the upstream solar wind at the termination shock.Nature,454(7200),63-66.
MLA Richardson, J. D.,et al."Cool heliosheath plasma and deceleration of the upstream solar wind at the termination shock".Nature 454.7200(2008):63-66.
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