Instability and propagation of EMIC waves in the magnetosphere by a kappa distribution

	Instability and propagation of EMIC waves in the magnetosphere by a kappa distribution
	Zhou, Qinghua; Xiao, Fuliang; Shi, Jiankui; Tang, Lijun
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
	2012
卷号	117 页码:A06203
ISSN号	0148-0227
通讯作者	Zhou, QH (reprint author), Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410004, Hunan, Peoples R China.
中文摘要	Electromagnetic ion cyclotron (EMIC) waves are excited near the magnetic equator by anisotropic ring current ions with energies near a few tens of keV. We investigate the instability and the path-integrated gain of EMIC waves during wave propagation. Calculations are performed by a global core density model, a field-aligned density model and particularly the hot ring current ions modeled by a kappa distribution. Simulating results show that the instability of EMIC waves is influenced primarily by the parameters of hot ring current ions, the wave normal angle and the composition of background plasma. A larger path-integrated gain occurs when the initial wave vector points toward lower L shells. During the storm main phase, the most common EMIC wave is the He+ band wave which occurs in the outer magnetosphere beyond the plasmapause with frequency just below the cyclotron frequency of He+. During the recovery phase, EMIC wave occurs in H+ band and He+ band with almost the same intensity in cases of interest. The O+ band EMIC waves are very weak and quite rare. This result presents a further insight into propagation and instability of EMIC waves under different geomagnetic activities.
英文摘要	Electromagnetic ion cyclotron (EMIC) waves are excited near the magnetic equator by anisotropic ring current ions with energies near a few tens of keV. We investigate the instability and the path-integrated gain of EMIC waves during wave propagation. Calculations are performed by a global core density model, a field-aligned density model and particularly the hot ring current ions modeled by a kappa distribution. Simulating results show that the instability of EMIC waves is influenced primarily by the parameters of hot ring current ions, the wave normal angle and the composition of background plasma. A larger path-integrated gain occurs when the initial wave vector points toward lower L shells. During the storm main phase, the most common EMIC wave is the He+ band wave which occurs in the outer magnetosphere beyond the plasmapause with frequency just below the cyclotron frequency of He+. During the recovery phase, EMIC wave occurs in H+ band and He+ band with almost the same intensity in cases of interest. The O+ band EMIC waves are very weak and quite rare. This result presents a further insight into propagation and instability of EMIC waves under different geomagnetic activities.
学科主题	空间物理
收录类别	SCI
资助信息	973 Program [2012CB825603]; National Natural Science Foundation of China [40931053, 40925014]; Specialized Research Fund for State Key Laboratories; construct program of the key discipline in Hunan Province
语种	英语
公开日期	2014-12-15
内容类型	期刊论文
源URL	[http://ir.nssc.ac.cn/handle/122/3074]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	Zhou, Qinghua,Xiao, Fuliang,Shi, Jiankui,et al. Instability and propagation of EMIC waves in the magnetosphere by a kappa distribution[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2012,117:A06203.
APA	Zhou, Qinghua,Xiao, Fuliang,Shi, Jiankui,&Tang, Lijun.(2012).Instability and propagation of EMIC waves in the magnetosphere by a kappa distribution.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,117,A06203.
MLA	Zhou, Qinghua,et al."Instability and propagation of EMIC waves in the magnetosphere by a kappa distribution".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 117(2012):A06203.