Kinetic Alfven wave instability driven by field-aligned currents in a low-beta plasma
文献类型：期刊论文
| 作者 | Chen, L.1,2; Wu, D. J.1; Huang, J.2
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| 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 |
| 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. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000325217100021 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6017]  |
| 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 210008, Jiangsu, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, L.,Wu, D. J.,Huang, J.. Kinetic Alfven wave instability driven by field-aligned currents in a low-beta plasma[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2013,118(6):2951-2957. |
| APA | Chen, L.,Wu, D. J.,&Huang, J..(2013).Kinetic Alfven wave instability driven by field-aligned currents in a low-beta plasma.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,118(6),2951-2957. |
| MLA | Chen, L.,et al."Kinetic Alfven wave instability driven by field-aligned currents in a low-beta plasma".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 118.6(2013):2951-2957. |
入库方式： OAI收割
来源：国家天文台
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