Nonlinear Landau resonance between EMIC waves and cold electrons in the inner magnetosphere

被引:14
作者
Wang, Bin [1 ]
Li, Pengyuan [1 ,2 ]
Huang, Jian [1 ]
Zhang, Bing [1 ]
机构
[1] Beijing Inst Tracing & Telecommun Technol, Beijing 100094, Peoples R China
[2] Zhejiang Univ, Polytech Inst, Hangzhou 310058, Zhejiang, Peoples R China
基金
中国国家自然科学基金;
关键词
ION-CYCLOTRON WAVES; RADIATION BELT ELECTRONS; COHERENT VLF WAVES; RING CURRENT; RELATIVISTIC ELECTRONS; ENERGETIC ELECTRONS; SCATTERING; STORM; ANGLE; PLASMAPAUSE;
D O I
10.1063/1.5088374
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
It has been suggested previously that electromagnetic ion cyclotron (EMIC) waves can heat cold electrons (1-10 eV) via Landau resonance, these electrons being a source of energy for stable auroral red arc emissions. To investigate the energy transfer between cold electrons and EMIC waves in the present study, test-particle simulations were conducted to examine the interaction process at the microscopic level, with a particular focus on the nonlinearity. The nonlinear Landau resonance between cold electrons and EMIC waves was found to occur easily at normal EMIC wave amplitudes. Parametric studies were also conducted to determine how the nonlinearity depends on the electron pitch angle, energy, wave frequency, normal angle, and background plasma density. The simulation results suggest that the nonlinear resonance between EMIC waves and cold electrons is universal and probably plays an important role in damping EMIC waves in the equatorial region. Published under license by AIP Publishing.
引用
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页数:10
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