Kinetic structure and wave properties associated with sharp dipolarization front observed by Cluster

	Kinetic structure and wave properties associated with sharp dipolarization front observed by Cluster
	Huang, S. Y.; Zhou, M.; Deng, X. H.; Yuan, Z. G.; Pang, Y.; Wei, Q.; Su, W.; Li, H. M.; Wang, Q. Q.
刊名	ANNALES GEOPHYSICAE
	2012
卷号	30 期号:1 页码:97-107
关键词	Magnetospheric physics Energetic particles Magnetotail Plasma waves and instabilities precipitating
ISSN号	0992-7689
通讯作者	Huang, SY (reprint author), Wuhan Univ, Sch Elect Informat, Wuhan 430072, Peoples R China.
中文摘要	Multiple dipolarization fronts (DFs) were observed by Cluster spacecraft in the magnetotail during a substorm. These DFs were kinetic structures, embedded in the bursty plasma flow, and moved earthward (mainly) and dawnward. Intense electric field, parallel and perpendicular currents were detected in the DF layer. These front layers were energy dissipation region (load region) where the energy of electromagnetic fields were transferred to the plasma thermal and kinetic energy. This dissipation was dominated by electrons. There were enhancements of plasma waves around the DF region: wavelet results show that wave activities around the ion cyclotron frequency in the front layer were generated by Alfven ion cyclotron instability; whistler waves were also detected before, during and after the DFs, which are triggered by electron temperature anisotropy and coincident with enhancement of energetic electron fluxes. The observation of these waves could be important for the understanding of evolution of DF and electron energization during the substorm. We discuss the generation mechanism of the DFs and suggest that these DFs were generated in the process of transient reconnection, and then traveled toward the Earth.
英文摘要	Multiple dipolarization fronts (DFs) were observed by Cluster spacecraft in the magnetotail during a substorm. These DFs were kinetic structures, embedded in the bursty plasma flow, and moved earthward (mainly) and dawnward. Intense electric field, parallel and perpendicular currents were detected in the DF layer. These front layers were energy dissipation region (load region) where the energy of electromagnetic fields were transferred to the plasma thermal and kinetic energy. This dissipation was dominated by electrons. There were enhancements of plasma waves around the DF region: wavelet results show that wave activities around the ion cyclotron frequency in the front layer were generated by Alfven ion cyclotron instability; whistler waves were also detected before, during and after the DFs, which are triggered by electron temperature anisotropy and coincident with enhancement of energetic electron fluxes. The observation of these waves could be important for the understanding of evolution of DF and electron energization during the substorm. We discuss the generation mechanism of the DFs and suggest that these DFs were generated in the process of transient reconnection, and then traveled toward the Earth.
学科主题	空间物理
收录类别	SCI ; EI
资助信息	National Natural Science Foundation of China (NSFC) [40890163, 41004060]; Specialized Research Fund for State Key Laboratories; Fundamental Research Funds for the Central Universities
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/122/3258]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	Huang, S. Y.,Zhou, M.,Deng, X. H.,et al. Kinetic structure and wave properties associated with sharp dipolarization front observed by Cluster[J]. ANNALES GEOPHYSICAE,2012,30(1):97-107.
APA	Huang, S. Y..,Zhou, M..,Deng, X. H..,Yuan, Z. G..,Pang, Y..,...&Wang, Q. Q..(2012).Kinetic structure and wave properties associated with sharp dipolarization front observed by Cluster.ANNALES GEOPHYSICAE,30(1),97-107.
MLA	Huang, S. Y.,et al."Kinetic structure and wave properties associated with sharp dipolarization front observed by Cluster".ANNALES GEOPHYSICAE 30.1(2012):97-107.