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Nonlinear interaction between ring current protons and electromagnetic ion cyclotron waves
Zhu, Hui; Su, Zhenpeng; Xiao, Fuliang; Zheng, Huinan; Shen, Chao; Wang, Yuming; Wang, Shui; Su, ZP (reprint author), Univ Sci & Technol China, Dept Geophys & Planetary Sci, CAS Key Lab Geospace Environm, Hefei 230026, Anhui, Peoples R China.
Department空间科学部
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2012
Volume117Pages:A12217
ISSN0148-0227
Language英语
AbstractElectromagnetic ion cyclotron (EMIC) waves have long been suggested to account for the rapid decay of ring current, which is usually described by the quasi-linear theory. We demonstrate that the interactions between ring current protons and typical EMIC waves can be highly nonlinear. A dimensionless parameter R is derived to identify the nonlinear interaction region, and a test-particle simulation is performed to analyze the motions of typical (kinetic energy E-k = 50 keV) ring current protons in detail. Nonlinear phase bunching occurs widely in the region R similar to<1, whereas nonlinear phase trapping is confined in the region R similar to 1. The former produces the non-stochastic pitch angle decrease, probably increasing the overall loss rate predicted by the quasi-linear theory. In contrast, the latter causes the significant pitch angle increase, probably reducing the overall loss rate estimated from the quasi-linear theory. These two nonlinear mechanisms lead to complex advection and diffusion processes, and an advection-diffusion modeling is required to more accurately simulate the ring current decay induced by EMIC waves. Citation: Zhu, H., Z. Su, F. Xiao, H. Zheng, C. Shen, Y. Wang, and S. Wang (2012), Nonlinear interaction between ring current protons and electromagnetic ion cyclotron waves, J. Geophys. Res., 117, A12217, doi:10.1029/2012JA018088.; Electromagnetic ion cyclotron (EMIC) waves have long been suggested to account for the rapid decay of ring current, which is usually described by the quasi-linear theory. We demonstrate that the interactions between ring current protons and typical EMIC waves can be highly nonlinear. A dimensionless parameter R is derived to identify the nonlinear interaction region, and a test-particle simulation is performed to analyze the motions of typical (kinetic energy E-k = 50 keV) ring current protons in detail. Nonlinear phase bunching occurs widely in the region R similar to<1, whereas nonlinear phase trapping is confined in the region R similar to 1. The former produces the non-stochastic pitch angle decrease, probably increasing the overall loss rate predicted by the quasi-linear theory. In contrast, the latter causes the significant pitch angle increase, probably reducing the overall loss rate estimated from the quasi-linear theory. These two nonlinear mechanisms lead to complex advection and diffusion processes, and an advection-diffusion modeling is required to more accurately simulate the ring current decay induced by EMIC waves. Citation: Zhu, H., Z. Su, F. Xiao, H. Zheng, C. Shen, Y. Wang, and S. Wang (2012), Nonlinear interaction between ring current protons and electromagnetic ion cyclotron waves, J. Geophys. Res., 117, A12217, doi:10.1029/2012JA018088.
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/122/3071
Collection空间科学部
Corresponding AuthorSu, ZP (reprint author), Univ Sci & Technol China, Dept Geophys & Planetary Sci, CAS Key Lab Geospace Environm, Hefei 230026, Anhui, Peoples R China.
Recommended Citation
GB/T 7714
Zhu, Hui,Su, Zhenpeng,Xiao, Fuliang,et al. Nonlinear interaction between ring current protons and electromagnetic ion cyclotron waves[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2012,117:A12217.
APA Zhu, Hui.,Su, Zhenpeng.,Xiao, Fuliang.,Zheng, Huinan.,Shen, Chao.,...&Su, ZP .(2012).Nonlinear interaction between ring current protons and electromagnetic ion cyclotron waves.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,117,A12217.
MLA Zhu, Hui,et al."Nonlinear interaction between ring current protons and electromagnetic ion cyclotron waves".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 117(2012):A12217.
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