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题名: The nonlinear interactions between O+ ions and oxygen band EMIC waves
作者: Wang, Zhiqiang; Pan, Zhirui; Zhai, Hao; Gao, Zhuxiu; Sun, Kang; Zhang, Yusheng
作者部门: 空间科学部
通讯作者: Wang, ZQ (reprint author), Nanjing Univ Aeronaut & Astronaut, Coll Astronaut, Dept Space Sci & Applicat, Nanjing, Jiangsu, Peoples R China. ; Wang, ZQ (reprint author), Chinese Acad Sci, State Key Lab Space Weather, Beijing, Peoples R China. ; Wang, ZQ (reprint author), Changsha Univ Sci & Technol, Hunan Prov Higher Educ Key Lab Modeling & Monitor, Changsha, Hunan, Peoples R China.
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
ISSN号: 2169-9380
出版日期: 2017
卷号: 122, 期号:7, 页码:7097-7109
收录类别: SCI
项目资助者: NSFC [41504124] ; Specialized Research Fund for State Key Laboratories ; Fundamental Research Funds for the Central Universities [NS2015089] ; Open Research Fund of the Hunan Province Higher Education Key Laboratory of Modeling and Monitoring on the Near-Earth Electromagnetic Environments, Changsha University of Science and Technology
英文摘要: During geomagnetically active times, O+ ions from the ionosphere become an important ion component in the ring current, which changes the dispersion relations and significantly enlarges the growth rate of oxygen band electromagnetic ion cyclotron (EMIC) waves. Motivated by a large number of oxygen band EMIC wave observations in the inner magnetosphere, we study the nonlinear motions of ring current O+ ions caused by the cyclotron resonance with oxygen band EMIC waves. A dimensionless parameter R is used to characterize the competition between wave-induced and adiabatic motions. The numerical calculations based on gyroaveraged test particle equations are performed. For typical 20 keV O+ ions at L = 5, two kinds of nonlinear processes occur simultaneously when alpha(eq) > 59 degrees (R < 2.16): the phase trapping and phase bunching. The phase trapping tends to transport the O+ ions away from the loss cone and reduce the overall loss rate estimated from the quasi-linear theory. Instead, phase bunching tends to increase the overall loss rate. The phase-trapped O+ ions have chance to be accelerated drastically, reaching 750% of the initial energy. These O+ ions move forward and backward alternatively along the field lines when they are bouncing back to the equator, forming a periodic energy variation which has not been reported before. The results suggest that the oxygen band EMIC waves, which appear frequently during storms, should be considered in the ring current dynamics in terms of nonlinear acceleration and resonance scattering of ring current particles.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/6019
Appears in Collections:空间科学部_期刊论文

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