EXCITATION OF KINETIC ALFVEN WAVES BY FAST ELECTRON BEAMS

	EXCITATION OF KINETIC ALFVEN WAVES BY FAST ELECTRON BEAMS
	Chen, L.1,2 ; Wu, D. J. p 1; Zhao, G. Q.1,3; Tang, J. F.4 ; Huang, J.2
刊名	ASTROPHYSICAL JOURNAL
	2014-09-20
卷号	793 期号:1
关键词	instabilities plasmas Sun: activity waves
英文摘要	Energetic electron beams, which are ubiquitous in a large variety of active phenomena in space and astrophysical plasmas, are one of the most important sources that drive plasma instabilities. In this paper, taking account of the return-current effect of fast electron beams, kinetic Alfven wave (KAW) instability driven by a fast electron beam is investigated in a finite-beta plasma of Q < beta < 1 (where beta is the kinetic-to-magnetic pressure ratio and Q = m(e)/m(i) is the mass ratio of electrons to ions). The results show that the kinetic resonant interaction of beam electrons is the driving source for KAW instability, unlike the case driven by a fast ion beam, where both the kinetic resonant interaction of beam ions and the return-current are the driving source for the KAW instability. KAW instability has a nonzero growth rate in the range of the perpendicular wave number, 0 < k(perpendicular to) < k(perpendicular to)(u), and the maximum growth rate, gamma(m), occurs between 0.5k(perpendicular to)(u) < k(perpendicular to)(m) < 0.8k(perpendicular to)(u). Both the maximal growing perpendicular wave number k(perpendicular to)(m) and the maximal growth rate gamma(m) depend sensitively on the velocity of electron beam upsilon(b), and the most favorable beam velocity occurs between 8 upsilon(A) < upsilon(b) < 10 upsilon(A). On the other hand, the excited KAWs are weakly dispersive with k(perpendicular to) rho(i) < 1 and have the maximum growth rate at relatively low perpendicular wave numbers in the range 0.3 < k(perpendicular to)(m) rho(i) < 0.6 for a beam velocity upsilon(b) < 10 upsilon(A). A possible application to the upward electron beams in the terrestrial magnetosphere is briefly discussed.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	RETURN CURRENT SYSTEMS ; SOLAR CORONAL LOOPS ; INSTABILITY DRIVEN ; HOSE INSTABILITY ; PLASMA ; ACCELERATION ; IONOSPHERE ; FIELD ; TURBULENCE ; RESONANCE
收录类别	SCI
语种	英语
WOS记录号	WOS:000341301700013
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/607]
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, Purple Mt Observ, Nanjing, Jiangsu, Peoples R China 2.Chinese Acad Sci, Key Lab Solar Act, Natl Astron Observ, Beijing, Peoples R China 3.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China
推荐引用方式 GB/T 7714	Chen, L.,Wu, D. J. p,Zhao, G. Q.,et al. EXCITATION OF KINETIC ALFVEN WAVES BY FAST ELECTRON BEAMS[J]. ASTROPHYSICAL JOURNAL,2014,793(1).
APA	Chen, L.,Wu, D. J. p,Zhao, G. Q.,Tang, J. F.,&Huang, J..(2014).EXCITATION OF KINETIC ALFVEN WAVES BY FAST ELECTRON BEAMS.ASTROPHYSICAL JOURNAL,793(1).
MLA	Chen, L.,et al."EXCITATION OF KINETIC ALFVEN WAVES BY FAST ELECTRON BEAMS".ASTROPHYSICAL JOURNAL 793.1(2014).