Modeling for precipitation loss of ring current protons by electromagnetic ion cyclotron waves

	Modeling for precipitation loss of ring current protons by electromagnetic ion cyclotron waves
	Xiao, Fuliang; Chen, Liangxu; He, Yihua; Su, Zhenpeng; Zheng, Huinan
刊名	JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
	2011
卷号	73 期号:1 页码:106-111
关键词	Wave-particle interaction Ring current protons Precipitation loss EMIC waves
ISSN号	1364-6826
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 examine the precipitation loss of ring current protons produced by the electromagnetic ion cyclotron (EMIC) waves at the location L=3.5 where the symmetrical ring current primarily occurs. Using a recently introduced hybrid finite difference (HFD) method, we solve the standard Fokker-Planck diffusion equation with incorporation of the cross diffusion terms that were often ignored in the previous work. We show that EMIC waves can produce efficient pitch angle scattering of energetic (tens of key) protons, yielding a rapid decrement in the flux with a time scale of a few hours, consistent with observational data. We also demonstrate that omission of the cross diffusion terms generally overestimates the decrement in the flux, typically by a factor of similar to 2 after a few hours at lower pitch angles, suggesting that the cross terms also play an important role in precipitation loss of ring current protons. (C) 2010 Elsevier Ltd. All rights reserved.
英文摘要	We examine the precipitation loss of ring current protons produced by the electromagnetic ion cyclotron (EMIC) waves at the location L=3.5 where the symmetrical ring current primarily occurs. Using a recently introduced hybrid finite difference (HFD) method, we solve the standard Fokker-Planck diffusion equation with incorporation of the cross diffusion terms that were often ignored in the previous work. We show that EMIC waves can produce efficient pitch angle scattering of energetic (tens of key) protons, yielding a rapid decrement in the flux with a time scale of a few hours, consistent with observational data. We also demonstrate that omission of the cross diffusion terms generally overestimates the decrement in the flux, typically by a factor of similar to 2 after a few hours at lower pitch angles, suggesting that the cross terms also play an important role in precipitation loss of ring current protons. (C) 2010 Elsevier Ltd. All rights reserved.
学科主题	空间物理
收录类别	SCI ; EI
资助信息	National Natural Science Foundation of China [40931053, 40874076, 40925014, 40774079]; Special Fund for Public Welfare Industry (meteorology) [GYHY200806024]; Changsha University of Science and Technology; 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/122/3118]
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,Chen, Liangxu,He, Yihua,et al. Modeling for precipitation loss of ring current protons by electromagnetic ion cyclotron waves[J]. JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS,2011,73(1):106-111.
APA	Xiao, Fuliang,Chen, Liangxu,He, Yihua,Su, Zhenpeng,&Zheng, Huinan.(2011).Modeling for precipitation loss of ring current protons by electromagnetic ion cyclotron waves.JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS,73(1),106-111.
MLA	Xiao, Fuliang,et al."Modeling for precipitation loss of ring current protons by electromagnetic ion cyclotron waves".JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS 73.1(2011):106-111.