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题名: First in situ evidence of electron pitch angle scattering due to magnetic field line curvature in the Ion diffusion region
作者: Zhang, Y. C.; Shen, C.; Marchaudon, A.; Rong, Z. J.; Lavraud, B.; Fazakerley, A.; Yao, Z.; Mihaljcic, B.; Ji, Y.; Ma, Y. H.; Liu, Z. X.
作者部门: 空间科学部
通讯作者: Zhang, YC (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China. ; Zhang, YC (reprint author), Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China. ; Zhang, YC (reprint author), Univ Toulouse UPS, Inst Rech & Astrophys & Planetol, Toulouse, France. ; Zhang, YC (reprint author), CNRS, UMR 5277, Toulouse, France.
关键词: plasma sheet ; magnetic reconnection ; magnetic curvature ; pitch angle scattering
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
ISSN号: 2169-9380
出版日期: 2016
卷号: 121, 期号:5, 页码:4103-4110
收录类别: SCI
项目资助者: National Natural Science Foundation of China [41574163, 41231066] ; Specialized Research Fund for State Key Laboratories ; China Scholarship Council [201404910001] ; UK Science and Technology Facilities Council [ST/K000977/1] ; ESA CSA
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.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/5671
Appears in Collections:空间科学部_期刊论文

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