A teardrop-shaped ionosphere at Venus in tenuous solar wind

doi:10.1016/j.pss.2012.08.024

	A teardrop-shaped ionosphere at Venus in tenuous solar wind
	Wei, Y.1; Fraenz, M.1; Dubinin, E.1; Coates, A. J.2; Zhang, T. L.3; Wan, W.4; Feng, L.5; Angsmann, A.1; Opitz, A.6; Woch, J.1
刊名	PLANETARY AND SPACE SCIENCE
	2012-12-01
卷号	73 期号:1 页码:254-261
关键词	Venus Ionosphere Cometary ionosphere
ISSN号	0032-0633
DOI	10.1016/j.pss.2012.08.024
文献子类	Article
英文摘要	A very tenuous solar wind regime, following a series of large coronal mass ejections, impacted Venus during early August, 2010. STEREO-B downstream from Venus observed that the solar wind density at Earth orbit dropped to similar to 0.1 #/cm(3) and persisted at this value over 1 day. A similar low value was observed at Earth in 1999 and has attracted comprehensive attention (Lazarus, A.J., 2000. Solar physics: the day the solar wind almost disappeared. Science 287, 2172-2173.), especially its consequences on Earth's ionosphere and magnetosphere (Lockwood, M., 2001. Astronomy: the day the solar wind nearly died. Nature 409, 677-679.). We now have an opportunity to examine the response of Venus' ionosphere to such a tenuous solar wind. After Venus Express spacecraft entered the ionosphere near the terminator, it continuously sampled O+ dominated planetary plasma on the nightside till it left the optical shadow region when Venus Express was located at 2 R-V (Venus' Radii) to the Venus center and 1.1 R-V to the Sun-Venus line. Moreover, the O+ speed was lower than the gravitational escape speed. We interpret this low-speed O+ as a constituent of the extended nightside ionosphere as a consequence of long-duration (18 h) tenuous solar wind, because the very low dynamic pressure enhances the source and reduces the sink of the nightside ionosphere. Though the full extent of the nightside ionosphere is not known due to the limitation of spacecraft's trajectory, our results suggest that the global configuration of Venus' ionosphere could resemble a teardrop-shaped cometary ionosphere. (C) 2012 Elsevier Ltd. All rights reserved.
WOS关键词	MAGNETIC-FIELD OBSERVATIONS ; NIGHTSIDE IONOSPHERE ; EXPRESS ; PLASMA ; MARS ; LOCATION ; ASPERA-4 ; ORBITER ; ESCAPE ; MODEL
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000314007400034
资助机构	Deutsche Forschungsgemeinschaft (DFG)(WO910/3-1) ; Deutsche Forschungsgemeinschaft (DFG)(WO910/3-1) ; German Aerospace Agency (DLR)(50QM0801) ; German Aerospace Agency (DLR)(50QM0801) ; National Science Foundation of China(41004072) ; National Science Foundation of China(41004072) ; National Important Basic Research Project(2011CB811405) ; National Important Basic Research Project(2011CB811405) ; NSFC(11003047) ; NSFC(11003047) ; MSTC(2011CB811402) ; MSTC(2011CB811402) ; Key Laboratory of Dark Matter and Space Astronomy, CAS ; Key Laboratory of Dark Matter and Space Astronomy, CAS ; (BK2012889) ; (BK2012889) ; Deutsche Forschungsgemeinschaft (DFG)(WO910/3-1) ; Deutsche Forschungsgemeinschaft (DFG)(WO910/3-1) ; German Aerospace Agency (DLR)(50QM0801) ; German Aerospace Agency (DLR)(50QM0801) ; National Science Foundation of China(41004072) ; National Science Foundation of China(41004072) ; National Important Basic Research Project(2011CB811405) ; National Important Basic Research Project(2011CB811405) ; NSFC(11003047) ; NSFC(11003047) ; MSTC(2011CB811402) ; MSTC(2011CB811402) ; Key Laboratory of Dark Matter and Space Astronomy, CAS ; Key Laboratory of Dark Matter and Space Astronomy, CAS ; (BK2012889) ; (BK2012889) ; Deutsche Forschungsgemeinschaft (DFG)(WO910/3-1) ; Deutsche Forschungsgemeinschaft (DFG)(WO910/3-1) ; German Aerospace Agency (DLR)(50QM0801) ; German Aerospace Agency (DLR)(50QM0801) ; National Science Foundation of China(41004072) ; National Science Foundation of China(41004072) ; National Important Basic Research Project(2011CB811405) ; National Important Basic Research Project(2011CB811405) ; NSFC(11003047) ; NSFC(11003047) ; MSTC(2011CB811402) ; MSTC(2011CB811402) ; Key Laboratory of Dark Matter and Space Astronomy, CAS ; Key Laboratory of Dark Matter and Space Astronomy, CAS ; (BK2012889) ; (BK2012889) ; Deutsche Forschungsgemeinschaft (DFG)(WO910/3-1) ; Deutsche Forschungsgemeinschaft (DFG)(WO910/3-1) ; German Aerospace Agency (DLR)(50QM0801) ; German Aerospace Agency (DLR)(50QM0801) ; National Science Foundation of China(41004072) ; National Science Foundation of China(41004072) ; National Important Basic Research Project(2011CB811405) ; National Important Basic Research Project(2011CB811405) ; NSFC(11003047) ; NSFC(11003047) ; MSTC(2011CB811402) ; MSTC(2011CB811402) ; Key Laboratory of Dark Matter and Space Astronomy, CAS ; Key Laboratory of Dark Matter and Space Astronomy, CAS ; (BK2012889) ; (BK2012889)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/84474]
专题	中国科学院地质与地球物理研究所
通讯作者	Wei, Y.
作者单位	1.Max Planck Inst Solar Syst Res, D-37191 Katlenburg Lindau, Germany 2.Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England 3.Austrian Acad Sci, Space Res Inst, A-8010 Graz, Austria 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China 5.Chinese Acad Sci, Purple Mt Observ, Nanjing, Jiangsu, Peoples R China 6.Univ Toulouse, Inst Rech Astrophys & Plantol CNRS UPS, Toulouse, France 7.Swedish Inst Space Phys, S-98128 Kiruna, Sweden
推荐引用方式 GB/T 7714	Wei, Y.,Fraenz, M.,Dubinin, E.,et al. A teardrop-shaped ionosphere at Venus in tenuous solar wind[J]. PLANETARY AND SPACE SCIENCE,2012,73(1):254-261.
APA	Wei, Y..,Fraenz, M..,Dubinin, E..,Coates, A. J..,Zhang, T. L..,...&Lundin, R..(2012).A teardrop-shaped ionosphere at Venus in tenuous solar wind.PLANETARY AND SPACE SCIENCE,73(1),254-261.
MLA	Wei, Y.,et al."A teardrop-shaped ionosphere at Venus in tenuous solar wind".PLANETARY AND SPACE SCIENCE 73.1(2012):254-261.