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Chaos-induced resistivity of collisionless magnetic reconnection in the presence of a guide field
Shang, Meng1,2; Wu, De-Jin1; Chen, Ling1; Chen, Peng-Fei3,4
2017
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume17Issue:1Pages:10
Corresponding AuthorWu, De-Jin(djwu@pmo.ac.cn)
AbstractOne of the most puzzling problems in astrophysics is to understand the anomalous resistivity in collisionless magnetic reconnection that is believed extensively to be responsible for the energy release in various eruptive phenomena. The magnetic null point in the reconnecting current sheet, acting as a scattering center, can lead to chaotic motions of particles in the current sheet, which is one of the possible mechanisms for anomalous resistivity and is called chaos-induced resistivity. In many interesting cases, however, instead of the magnetic null point, there is a nonzero magnetic field perpendicular to the merging field lines, usually called the guide field, whose effect on chaos-induced resistivity has been an open problem. By use of the test particle simulation method and statistical analysis, we investigate chaos-induced resistivity in the presence of a constant guide field. The characteristics of particle motion in the reconnecting region, in particular, the chaotic behavior of particle orbits and evolving statistical features, are analyzed. The results show that as the guide field increases, the radius of the chaos region increases and the Lyapunov index decreases. However, the effective collision frequency, and hence the chaos-induced resistivity, reach their peak values when the guide field approaches half of the characteristic strength of the reconnection magnetic field. The presence of a guide field can significantly influence the chaos of the particle orbits and hence the chaos-induced resistivity in the reconnection sheet, which decides the collisionless reconnection rate. The present result is helpful for us to understand the micro physics of anomalous resistivity in collisionless reconnection with a guide field.
Keywordmagnetic reconnection plasmas chaos Sun: flares
DOI10.1088/1674-4527/17/1/3
WOS KeywordDYNAMICS ; MOTION ; LAW
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000396489000003
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23223
Collection中国科学院紫金山天文台
Corresponding AuthorWu, De-Jin
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Key Lab Planetary Sci, Nanjing 210008, Jiangsu, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Jiangsu, Peoples R China
4.Nanjing Univ, Key Lab Modern Astron & Astrophys, Nanjing 210023, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Shang, Meng,Wu, De-Jin,Chen, Ling,et al. Chaos-induced resistivity of collisionless magnetic reconnection in the presence of a guide field[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2017,17(1):10.
APA Shang, Meng,Wu, De-Jin,Chen, Ling,&Chen, Peng-Fei.(2017).Chaos-induced resistivity of collisionless magnetic reconnection in the presence of a guide field.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,17(1),10.
MLA Shang, Meng,et al."Chaos-induced resistivity of collisionless magnetic reconnection in the presence of a guide field".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 17.1(2017):10.
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