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First in situ evidence of electron pitch angle scattering due to magnetic field line curvature in the Ion diffusion region
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.; 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.
Department空间科学部
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2016
Volume121Issue:5Pages:4103-4110
ISSN2169-9380
Language英语
KeywordPlasma Sheet Magnetic Reconnection Magnetic Curvature Pitch Angle Scattering
AbstractTheory 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.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/5671
Collection空间科学部
Corresponding AuthorZhang, 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.
Recommended Citation
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..,...&Zhang, YC .(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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