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Low-frequency waves in magnetic reconnection
Chai LiHui; Li Yi; Wang Shui; Shen Chao; Li, Y (reprint author), Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Peoples R China.
Department空间科学部
Source PublicationCHINESE SCIENCE BULLETIN
2012
Volume57Issue:12Pages:1461-1466
ISSN1001-6538
Language英语
KeywordMagnetic Reconnection Low-frequency Waves Alfven-ion Cyclotron Waves Hall Quadrupole Structure
AbstractThe characteristics of low-frequency waves in magnetic reconnection are studied using two-dimensional hybrid simulation code. In a coordinate system moving with fluid, the time series of a magnetic field perpendicular to the magnetic reconnection plane, B-y, is transformed into the power spectrum via fast Fourier transformation, while the wave propagation direction and polarization are determined by minimum variance analysis of the electric field. The results show that low-frequency Alfven ion-cyclotron waves dominate the reconnection area. These waves have frequencies 0-1 Omega(p) (where Omega(p) is the local proton gyro frequency) and all are left-handed circularly polarized. Among these waves, large-amplitude turbulence, with frequencies of 0-0.6 Omega(p) and isotropic propagation, dominates the outflow regions. This can cause the reversal of B-y in the quadrupole structure. In the inflow regions, dominant waves, propagating mainly parallel to the ambient magnetic field, have higher frequencies and smaller amplitudes. The frequency of the main peak of wave energy is usually higher than 0.5 Omega(p).; The characteristics of low-frequency waves in magnetic reconnection are studied using two-dimensional hybrid simulation code. In a coordinate system moving with fluid, the time series of a magnetic field perpendicular to the magnetic reconnection plane, B-y, is transformed into the power spectrum via fast Fourier transformation, while the wave propagation direction and polarization are determined by minimum variance analysis of the electric field. The results show that low-frequency Alfven ion-cyclotron waves dominate the reconnection area. These waves have frequencies 0-1 Omega(p) (where Omega(p) is the local proton gyro frequency) and all are left-handed circularly polarized. Among these waves, large-amplitude turbulence, with frequencies of 0-0.6 Omega(p) and isotropic propagation, dominates the outflow regions. This can cause the reversal of B-y in the quadrupole structure. In the inflow regions, dominant waves, propagating mainly parallel to the ambient magnetic field, have higher frequencies and smaller amplitudes. The frequency of the main peak of wave energy is usually higher than 0.5 Omega(p).
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/3315
Collection空间科学部
Corresponding AuthorLi, Y (reprint author), Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Peoples R China.
Recommended Citation
GB/T 7714
Chai LiHui,Li Yi,Wang Shui,et al. Low-frequency waves in magnetic reconnection[J]. CHINESE SCIENCE BULLETIN,2012,57(12):1461-1466.
APA Chai LiHui,Li Yi,Wang Shui,Shen Chao,&Li, Y .(2012).Low-frequency waves in magnetic reconnection.CHINESE SCIENCE BULLETIN,57(12),1461-1466.
MLA Chai LiHui,et al."Low-frequency waves in magnetic reconnection".CHINESE SCIENCE BULLETIN 57.12(2012):1461-1466.
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