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EXCITATION OF KINETIC ALFVEN WAVES BY FAST ELECTRON BEAMS
Chen, L.1,2; Wu, D. J. p1; Zhao, G. Q.1,3; Tang, J. F.4; Huang, J.2
2014-09-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume793Issue:1Pages:0
AbstractEnergetic 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.
KeywordInstabilities Plasmas Sun: Activity Waves
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/793/1/13
WOS KeywordRETURN CURRENT SYSTEMS ; SOLAR CORONAL LOOPS ; INSTABILITY DRIVEN ; HOSE INSTABILITY ; PLASMA ; ACCELERATION ; IONOSPHERE ; FIELD ; TURBULENCE ; RESONANCE
URL查看原文
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000341301700013
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10638
Collection太阳和太阳系等离子体研究团组
Affiliation1.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
Recommended Citation
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):0.
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),0.
MLA Chen, L.,et al."EXCITATION OF KINETIC ALFVEN WAVES BY FAST ELECTRON BEAMS".ASTROPHYSICAL JOURNAL 793.1(2014):0.
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