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Anomalous deformation of the Earth's bow shock in the lunar wake: Joint measurement by Chang'E-1 and SELENE
Nishino, Masaki N.1; Wang, Xiao-Dong2; Fujimoto, Masaki1; Tsunakawa, Hideo3; Saito, Yoshifumi1; Yokota, Shoichiro1; Bian, Wei2; Li, Chun-Lai2; Matsushima, Masaki3; Shibuya, Hidetoshi4; Shimizu, Hisayoshi5; Takahashi, Futoshi3; Terasawa, Toshio6
2011-04-01
Source PublicationPLANETARY AND SPACE SCIENCE
Volume59Issue:5-6Pages:378-386
AbstractBecause the solar wind (SW) flow is usually super-sonic, a fast-mode bow shock (BS) is formed in front of the Earth's magnetosphere, and the Moon crosses the BS at both dusk and dawn flanks. On the other hand, behind of the Moon along the SW flow forms a tenuous region called lunar wake, where the flow can be sub-Alfvenic (and thus sub-sonic) because of its low-density status. Here we report, with joint measurement by Chang'E-1 and SELENE, that the Earth's BS surface is drastically deformed in the lunar wake. Despite the quasi-perpendicular shock configuration encountered at dusk flank under the Parker-spiral magnetic field, no clear shock surface can be found in the lunar wake, while instead gradual transition of the magnetic field from the upstream to downstream value was observed for a several-minute interval. This finding suggests that the 'magnetic ramp' is highly broadened in the wake where a fast-mode shock is no longer maintained due to the highly reduced density. On the other hand, observations at the 100 km altitude on the dayside show that the fast-mode shock is maintained even when the width of the downstream region is smaller than a typical scale length of a perpendicular shock. Our results suggest that the Moon is not so large to eliminate the BS at 100 km altitude on the dayside, while the magnetic field associated with the shock structure is drastically affected in the lunar wake. (C) 2011 Elsevier Ltd. All rights reserved.
KeywordBow Shock Solar Wind-moon Interaction Lunar Wake Multi-spacecraft Measurement
DOI10.1016/j.pss.2011.01.002
Indexed BySCI
Language英语
WOS IDWOS:000288581400002
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8059
Collection月球与深空探测研究部
Affiliation1.Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Chuo Ku, Kanagawa 2525210, Japan
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
3.Tokyo Inst Technol, Meguro Ku, Tokyo 1528551, Japan
4.Kumamoto Univ, Kumamoto 8608555, Japan
5.Univ Tokyo, Earthquake Res Inst, Bunkyo Ku, Tokyo 1130032, Japan
6.Univ Tokyo, Inst Cosm Ray Res, Chiba 2778582, Japan
Recommended Citation
GB/T 7714
Nishino, Masaki N.,Wang, Xiao-Dong,Fujimoto, Masaki,et al. Anomalous deformation of the Earth's bow shock in the lunar wake: Joint measurement by Chang'E-1 and SELENE[J]. PLANETARY AND SPACE SCIENCE,2011,59(5-6):378-386.
APA Nishino, Masaki N..,Wang, Xiao-Dong.,Fujimoto, Masaki.,Tsunakawa, Hideo.,Saito, Yoshifumi.,...&Terasawa, Toshio.(2011).Anomalous deformation of the Earth's bow shock in the lunar wake: Joint measurement by Chang'E-1 and SELENE.PLANETARY AND SPACE SCIENCE,59(5-6),378-386.
MLA Nishino, Masaki N.,et al."Anomalous deformation of the Earth's bow shock in the lunar wake: Joint measurement by Chang'E-1 and SELENE".PLANETARY AND SPACE SCIENCE 59.5-6(2011):378-386.
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