Excitation of Langmuir waves by the lower energy cutoff behavior of power-law electrons

	Excitation of Langmuir waves by the lower energy cutoff behavior of power-law electrons
	Tang, Jianfei1,2,3 ; Wu, Dejin 2; Zhao, Guoqing 2; Chen, Ling 2; Tan, Chengming 3
刊名	ASTROPHYSICS AND SPACE SCIENCE
	2014-09-01
卷号	353 期号:1 页码:131-135
关键词	Instabilities Radiation mechanisms: non-thermal Waves Sun: radio radiation
英文摘要	Langmuir waves (LWs), which are believed to play a crucial role in the plasma emission of solar radio bursts, can be excited by streaming instability of energetic electron beams. However, solar hard X-ray observations imply that the energetic flare electrons usually have a power-law energy distribution with a lower energy cutoff. In this paper, we investigate LWs driven by the power-law electrons. The results show that power-law electrons with the steepness cutoff behavior can excite LWs effectively because of the population inversion distribution below the cutoff energy (E (c) ). The growth rate of LWs increases with the steepness index (delta) and decreases with the power-law index (alpha). The wave number of the fastest growing LWs (k lambda (D) ), decreases with the characteristic velocity of the power-law electrons () and increases with the thermal velocity of ambient electrons (v (T) ). This can be helpful for us to understand better the physics of LWs and the dynamics of energetic electron beams in space and astrophysical plasmas.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	SOLAR RADIO-EMISSION ; HARD X-RAY ; STOCHASTIC-GROWTH THEORY ; PLASMA EMISSION ; BURSTS ; FLARES ; RADIATION ; MECHANISM
收录类别	SCI
语种	英语
WOS记录号	WOS:000339969100015
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/596]
专题	新疆天文台_光学天文与技术应用研究室
作者单位	1.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Xinjiang, Peoples R China 2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Tang, Jianfei,Wu, Dejin,Zhao, Guoqing,et al. Excitation of Langmuir waves by the lower energy cutoff behavior of power-law electrons[J]. ASTROPHYSICS AND SPACE SCIENCE,2014,353(1):131-135.
APA	Tang, Jianfei,Wu, Dejin,Zhao, Guoqing,Chen, Ling,&Tan, Chengming.(2014).Excitation of Langmuir waves by the lower energy cutoff behavior of power-law electrons.ASTROPHYSICS AND SPACE SCIENCE,353(1),131-135.
MLA	Tang, Jianfei,et al."Excitation of Langmuir waves by the lower energy cutoff behavior of power-law electrons".ASTROPHYSICS AND SPACE SCIENCE 353.1(2014):131-135.