Rapid acceleration of radiation belt energetic electrons by Z-mode waves

	Rapid acceleration of radiation belt energetic electrons by Z-mode waves
	Xiao, Fuliang; Zhang, Sai; Su, Zhenpeng; He, Zhaoguo; Tang, Lijun
刊名	GEOPHYSICAL RESEARCH LETTERS
	2012
卷号	39 页码:L03103
ISSN号	0094-8276
通讯作者	Xiao, FL (reprint author), Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410004, Hunan, Peoples R China.
中文摘要	We present the first simulation of the effect of Z-mode waves on the outer radiation belt electron dynamics. We calculate bounce-averaged diffusion rates in pitch angle and momentum and then use them as inputs to solve a 2-D momentum-pitch angle diffusion equation. Numerical results show that the phase space density (PSD) of 1 MeV electrons can enhance substantially and very rapidly (e. g., 30 minutes). In particular, the momentum diffusion rate exceeds the pitch angle and cross diffusion rates at 0.5 MeV and above, a behavior completely different from that for EMIC and chorus waves. Consequently, momentum (instead of pitch angle or cross) diffusion plays a dominant role in the dynamic evolution of energetic electrons. Moreover, the PSD evolution is found to be very dependent upon the assumed initial particle distributions. These results provide further insights on the interplay between acceleration mechanisms of outer radiation belt electrons. Citation: Xiao, F., S. Zhang, Z. Su, Z. He, and L. Tang (2012), Rapid acceleration of radiation belt energetic electrons by Z-mode waves, Geophys. Res. Lett., 39, L03103, doi: 10.1029/2011GL050625.
英文摘要	We present the first simulation of the effect of Z-mode waves on the outer radiation belt electron dynamics. We calculate bounce-averaged diffusion rates in pitch angle and momentum and then use them as inputs to solve a 2-D momentum-pitch angle diffusion equation. Numerical results show that the phase space density (PSD) of 1 MeV electrons can enhance substantially and very rapidly (e. g., 30 minutes). In particular, the momentum diffusion rate exceeds the pitch angle and cross diffusion rates at 0.5 MeV and above, a behavior completely different from that for EMIC and chorus waves. Consequently, momentum (instead of pitch angle or cross) diffusion plays a dominant role in the dynamic evolution of energetic electrons. Moreover, the PSD evolution is found to be very dependent upon the assumed initial particle distributions. These results provide further insights on the interplay between acceleration mechanisms of outer radiation belt electrons. Citation: Xiao, F., S. Zhang, Z. Su, Z. He, and L. Tang (2012), Rapid acceleration of radiation belt energetic electrons by Z-mode waves, Geophys. Res. Lett., 39, L03103, doi: 10.1029/2011GL050625.
学科主题	空间物理
收录类别	SCI ; EI
资助信息	National Key Basic Research Special Foundation of China [2012CB825603]; National Natural Science Foundation of China [40931053, 40925014]; Specialized Research Fund for State Key Laboratories for Space Weather
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/122/3116]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	Xiao, Fuliang,Zhang, Sai,Su, Zhenpeng,et al. Rapid acceleration of radiation belt energetic electrons by Z-mode waves[J]. GEOPHYSICAL RESEARCH LETTERS,2012,39:L03103.
APA	Xiao, Fuliang,Zhang, Sai,Su, Zhenpeng,He, Zhaoguo,&Tang, Lijun.(2012).Rapid acceleration of radiation belt energetic electrons by Z-mode waves.GEOPHYSICAL RESEARCH LETTERS,39,L03103.
MLA	Xiao, Fuliang,et al."Rapid acceleration of radiation belt energetic electrons by Z-mode waves".GEOPHYSICAL RESEARCH LETTERS 39(2012):L03103.