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题名: Kinetic Alfven wave instability driven by field-aligned currents in a low-beta plasma
作者: Chen Ling(陈玲)1, 2; Wu, D. J.1; Huang, J.2
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
出版日期: 2013-06-01
卷号: 118, 期号:6, 页码:2951-2957
关键词: Kinetic Alfven wave ; instability ; field-aligned currents
DOI: 10.1002/jgra.50332
文章类型: Article
英文摘要: Kinetic Alfven waves (KAWs) can play an important role in the energization of plasma particles and the formation of filamentous structures, which commonly are encountered and frequently accompanied by field-aligned currents in various magneto-plasmas, such as laboratory, auroral, and coronal plasmas. Based on a low-frequency kinetic dispersion equation in frequency omega < omega(ci) (the ion cyclotron frequency), KAW instability driven by a field-aligned current, which is carried by the field-aligned drift of electrons at velocity V-D, is investigated in a low-beta plasma of beta < Q << 1, where beta is the kinetic-to-magnetic pressure ratio and Q (equivalent to m(e)/m(i) << 1) is the mass ratio of electrons to ions. An instability condition and the corresponding growth rate are obtained, which depends on the plasma beta parameter as well as the drift velocity V-D. The results show that the KAW instability occurs in the perpendicular wave number range of k(perpendicular to)(-) < k(perpendicular to) < k(perpendicular to)(+), in which the growth rate reaches its maximum at k(perpendicular to)(m) for fixed V-D and beta. As V-D increases, this growing wave number range widens and the growth rate increases, but the maximal-growing wave number k(perpendicular to)(m) decreases. On the other hand, as the plasma beta parameter decreases, the growing wave number range also widens, and the maximal-growing wave number and growth rate both increase. These results have potential importance in understanding the physics of the electric current dissipation and plasma active phenomena since the field-aligned current is one of the most active factors 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]: AURORAL ELECTRON ACCELERATION ; CORONAL LOOP OSCILLATIONS ; INTERSTELLAR TURBULENCE ; HOSE INSTABILITY ; HEAVY-IONS ; ENERGIZATION ; IDENTIFICATION ; EXCITATION ; RESONANCE ; REGION
收录类别: SCI
语种: 英语
WOS记录号: WOS:000325217100021
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15525
Appears in Collections:太阳和太阳系等离子体研究团组_期刊论文

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作者单位: 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing, Peoples R China
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