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![]() | |
刊名 | ASTROPHYSICAL JOURNAL
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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. |
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.bao.ac.cn/handle/114a11/6491] ![]() |
专题 | 国家天文台_太阳物理研究部 |
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). |
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