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题名: KINETIC ALFVEN WAVES EXCITED BY OBLIQUE MAGNETOHYDRODYNAMIC ALFVEN WAVES IN CORONAL HOLES
作者: Zhao, J. S.1, 2; Wu, D. J.1; Lu, J. Y.3
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2011-07-10
卷号: 735, 期号:2
关键词: instabilities ; plasmas ; Sun: corona ; waves
DOI: 10.1088/0004-637X/735/2/114
文章类型: Article
英文摘要: Kinetic Alfven waves (KAWs) are small-scale dispersive AWs that can play an important role in particle heating and acceleration of space and solar plasmas. An excitation mechanism for KAWs created by the coupling between large-scale oblique AWs and small-scale KAWs is presented in this paper. Taking into account both the collisional and Landau damping dissipations, the results show that the net growth rate of the excited KAWs increases with their perpendicular wavenumber k(perpendicular to) and reaches maximum at lambda(e)k(perpendicular to) similar to 0.3, where lambda(e) is the electron inertial length. However, for KAWs with shorter perpendicular wavelengths, the net growth rate decreases rapidly due to dissipative effects. The evaluation of the threshold amplitude of the AW implies that for KAWs with lambda(e)k(perpendicular to) < 0.3, the relative threshold amplitude is well below 10%, which is easy to satisfy. In particular, when applying this mechanism to the case of a solar coronal hole containing a dense plume structure, our results show that KAWs with lambda(e)k(perpendicular to) < 0.3 can be not only efficiently excited in the interplume region but also strongly dissipated in the dense plume due to the Landau damping.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: FAST SOLAR-WIND ; POLAR PLUME ; ELECTRON ACCELERATION ; NONLINEAR EXCITATION ; HEAVY-IONS ; QUIET-SUN ; PLASMA ; LINES ; GENERATION ; FIELD
收录类别: SCI
语种: 英语
WOS记录号: WOS:000292089700047
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15980
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, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing, Peoples R China
3.China Metereol Adm, Natl Ctr Space Weather, Beijing, Peoples R China
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