KINETIC ALFVEN WAVE INSTABILITY DRIVEN BY FIELD-ALIGNED CURRENTS IN SOLAR CORONAL LOOPS
文献类型：期刊论文
| 作者 | Chen, L. ; Wu, D. J.
|
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2012-08-01 |
| 卷号 | 754期号:2页码:123(7pp) |
| ISSN号 | 0004-637X |
| 关键词 | instabilities plasmas Sun: activity Sun: corona waves |
| 英文摘要 | Magneto-plasma loops, which trace closed solar magnetic field lines, are the primary structural elements of the solar corona. Kinetic Alfven wave (KAW) can play an important role in inhomogeneous heating of these magnetoplasma structures in the corona. By the use of a low-frequency kinetic dispersion equation, which is presented in this paper and is valid in a finite-beta plasma with Q < beta < 1 plasma (where beta is the kinetic to magnetic pressure ratio and Q = m(e)/m(i) is the mass ratio of electrons to ions), KAW instability driven by a field-aligned current in the current-carrying loops in the solar corona is investigated. The results show that the KAW instability can occur in wave number regimes 0 < k(z) < k(z)(c) and 0 < k(perpendicular to) < k(perpendicular to)(c), and that the critical wave numbers k(z)(c) and k(perpendicular to)(c) and the growth rate both considerably increase as the drift velocity V-D of the current-carrying electrons increases in the loops. In particular, for typical parameters of the current-carrying loops in the solar corona this instability mechanism results in a high growth rate of KAWs, omega(i) similar to 0.01-0.1 omega(ci) similar to 10(3)-10(4) s(-1). The results are of importance in understanding the physics of the electric current dissipation and plasma heating of the current-carrying loops in the solar corona. |
| 学科主题 | Astronomy & Astrophysics |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | MAGNETIC-FIELDS ; ELECTRIC-CURRENTS ; TRANSITION-REGION ; HOSE INSTABILITY ; ACTIVE REGIONS ; HEAVY-IONS ; PLASMA ; ENERGIZATION ; ACCELERATION ; OSCILLATIONS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000306666700044 |
| 公开日期 | 2013-01-31 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/8053]  |
| 专题 | 紫金山天文台_太阳和太阳系等离子体研究团组 |
| 作者单位 | Chinese Acad Sci, Purple Mt Observ, Nanjing, Jiangsu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, L.,Wu, D. J.. KINETIC ALFVEN WAVE INSTABILITY DRIVEN BY FIELD-ALIGNED CURRENTS IN SOLAR CORONAL LOOPS[J]. ASTROPHYSICAL JOURNAL,2012,754(2):123(7pp). |
| APA | Chen, L.,&Wu, D. J..(2012).KINETIC ALFVEN WAVE INSTABILITY DRIVEN BY FIELD-ALIGNED CURRENTS IN SOLAR CORONAL LOOPS.ASTROPHYSICAL JOURNAL,754(2),123(7pp). |
| MLA | Chen, L.,et al."KINETIC ALFVEN WAVE INSTABILITY DRIVEN BY FIELD-ALIGNED CURRENTS IN SOLAR CORONAL LOOPS".ASTROPHYSICAL JOURNAL 754.2(2012):123(7pp). |
入库方式： OAI收割
来源：紫金山天文台
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