Path-integrated gain of whistler-mode chorus in the magnetosphere by a kappa distribution

	Path-integrated gain of whistler-mode chorus in the magnetosphere by a kappa distribution
	Zhou, Qinghua; Shi, Jiankui; Xiao, Fuliang
刊名	PLASMA PHYSICS AND CONTROLLED FUSION
	2011
卷号	53 期号:6 页码:65003
ISSN号	0741-3335
通讯作者	Zhou, QH (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, Beijing 100190, Peoples R China.
中文摘要	The path-integrated gain of whistler-mode chorus is evaluated by the incorporation of a kappa distribution of energetic electrons and a realistic field-aligned density model of background electrons. Variations of temperature anisotropy and number density of energetic electrons along the magnetic latitude are derived based on the conservation of the first adiabatic invariant. Numerical simulation shows that a lower-band chorus has a much higher path-integrated gain than an upper-band chorus under the same conditions. During propagation towards higher latitudes, chorus waves grow to large amplitudes in the early stage but ultimately attenuate due to wave damping. The path-integrated gain is higher with the initial wave vector pointing toward lower L shells than toward higher L shells. Moreover, the energetic electron population has a significant influence on the path-integrated gain, and the wave gain is larger as the temperature anisotropy or the density of energetic electrons is enhanced. This result provides further understanding of the chorus wave propagation characteristics in space plasmas.
英文摘要	The path-integrated gain of whistler-mode chorus is evaluated by the incorporation of a kappa distribution of energetic electrons and a realistic field-aligned density model of background electrons. Variations of temperature anisotropy and number density of energetic electrons along the magnetic latitude are derived based on the conservation of the first adiabatic invariant. Numerical simulation shows that a lower-band chorus has a much higher path-integrated gain than an upper-band chorus under the same conditions. During propagation towards higher latitudes, chorus waves grow to large amplitudes in the early stage but ultimately attenuate due to wave damping. The path-integrated gain is higher with the initial wave vector pointing toward lower L shells than toward higher L shells. Moreover, the energetic electron population has a significant influence on the path-integrated gain, and the wave gain is larger as the temperature anisotropy or the density of energetic electrons is enhanced. This result provides further understanding of the chorus wave propagation characteristics in space plasmas.
学科主题	空间物理
收录类别	SCI ; EI
资助信息	National Natural Science Foundation of China [40874076, 40925014]; Specialized Research Fund for State Key Laboratories
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/122/3075]
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,Shi, Jiankui,Xiao, Fuliang. Path-integrated gain of whistler-mode chorus in the magnetosphere by a kappa distribution[J]. PLASMA PHYSICS AND CONTROLLED FUSION,2011,53(6):65003.
APA	Zhou, Qinghua,Shi, Jiankui,&Xiao, Fuliang.(2011).Path-integrated gain of whistler-mode chorus in the magnetosphere by a kappa distribution.PLASMA PHYSICS AND CONTROLLED FUSION,53(6),65003.
MLA	Zhou, Qinghua,et al."Path-integrated gain of whistler-mode chorus in the magnetosphere by a kappa distribution".PLASMA PHYSICS AND CONTROLLED FUSION 53.6(2011):65003.