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First in situ evidence of electron pitch angle scattering due to magnetic field line curvature in the Ion diffusion region

文献类型：期刊论文

作者Zhang, Y. C.1,2,3,4; Shen, C.5; Marchaudon, A.3,4; Rong, Z. J.2; Lavraud, B.3,4; Fazakerley, A.6; Yao, Z.6; Mihaljcic, B.6; Ji, Y.7; Ma, Y. H.5
刊名JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
出版日期2016-05-01
卷号121期号:5页码:4103-4110
关键词plasma sheet magnetic reconnection magnetic curvature pitch angle scattering
DOI10.1002/2016JA022409
文献子类Article
英文摘要Theory predicts that the first adiabatic invariant of a charged particle may be violated in a region of highly curved field lines, leading to significant pitch angle scattering for particles whose gyroradius are comparable to the radius of the magnetic field line curvature. This scattering generates more isotropic particle distribution functions, with important impacts on the presence or absence of plasma instabilities. Using magnetic curvature analysis based on multipoint Cluster spacecraft observations, we present the first investigation of magnetic curvature in the vicinity of an ion diffusion region where reconnected field lines are highly curved. Electrons at energies>8keV show a clear pitch angle ordering between bidirectional and trapped distribution in surrounding regions, while we show that in the more central part of the ion diffusion region electrons above such energies become isotropic. By contrast, colder electrons (1keV) retain their bidirectional character throughout the diffusion regions. The calculated adiabatic parameter K-2 for these electrons is in agreement with theory. This study provides the first observational evidence for particle pitch angle scattering due to magnetic field lines with well characterized curvature in a space plasma.
WOS关键词CHARGED-PARTICLE MOTION ; CURRENT SHEET ; CLUSTER ; MAGNETOTAIL ; RECONNECTION
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000380025500016
资助机构National Natural Science Foundation of China(41574163 ; National Natural Science Foundation of China(41574163 ; National Natural Science Foundation of China(41574163 ; National Natural Science Foundation of China(41574163 ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; China Scholarship Council(201404910001) ; China Scholarship Council(201404910001) ; China Scholarship Council(201404910001) ; China Scholarship Council(201404910001) ; UK Science and Technology Facilities Council(ST/K000977/1) ; UK Science and Technology Facilities Council(ST/K000977/1) ; UK Science and Technology Facilities Council(ST/K000977/1) ; UK Science and Technology Facilities Council(ST/K000977/1) ; ESA CSA ; ESA CSA ; ESA CSA ; ESA CSA ; 41231066) ; 41231066) ; 41231066) ; 41231066) ; National Natural Science Foundation of China(41574163 ; National Natural Science Foundation of China(41574163 ; National Natural Science Foundation of China(41574163 ; National Natural Science Foundation of China(41574163 ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; China Scholarship Council(201404910001) ; China Scholarship Council(201404910001) ; China Scholarship Council(201404910001) ; China Scholarship Council(201404910001) ; UK Science and Technology Facilities Council(ST/K000977/1) ; UK Science and Technology Facilities Council(ST/K000977/1) ; UK Science and Technology Facilities Council(ST/K000977/1) ; UK Science and Technology Facilities Council(ST/K000977/1) ; ESA CSA ; ESA CSA ; ESA CSA ; ESA CSA ; 41231066) ; 41231066) ; 41231066) ; 41231066)
源URL[http://ir.iggcas.ac.cn/handle/132A11/53381]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
作者单位1.Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
3.Univ Toulouse UPS, Inst Rech & Astrophys & Planetol, Toulouse, France
4.CNRS, UMR 5277, Toulouse, France
5.Harbin Inst Technol, Shenzhen Grad Sch, Shenzhen, Peoples R China
6.UCL, Mullard Space Sci Lab, London, England
7.Peking Univ, State Key Lab Turbulence & Complex Syst, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Y. C.,Shen, C.,Marchaudon, A.,et al. First in situ evidence of electron pitch angle scattering due to magnetic field line curvature in the Ion diffusion region[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2016,121(5):4103-4110.
APA Zhang, Y. C..,Shen, C..,Marchaudon, A..,Rong, Z. J..,Lavraud, B..,...&Liu, Z. X..(2016).First in situ evidence of electron pitch angle scattering due to magnetic field line curvature in the Ion diffusion region.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,121(5),4103-4110.
MLA Zhang, Y. C.,et al."First in situ evidence of electron pitch angle scattering due to magnetic field line curvature in the Ion diffusion region".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 121.5(2016):4103-4110.

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来源：地质与地球物理研究所

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