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KINETIC ALFVEN WAVES EXCITED BY OBLIQUE MAGNETOHYDRODYNAMIC ALFVEN WAVES IN CORONAL HOLES
Zhao, J. S.1,2; Wu, D. J.1; Lu, J. Y.3
2011-07-10
Source PublicationASTROPHYSICAL JOURNAL
Volume735Issue:2
AbstractKinetic 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.
KeywordInstabilities Plasmas Sun: Corona Waves
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/735/2/114
WOS KeywordFAST SOLAR-WIND ; POLAR PLUME ; ELECTRON ACCELERATION ; NONLINEAR EXCITATION ; HEAVY-IONS ; QUIET-SUN ; PLASMA ; LINES ; GENERATION ; FIELD
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000292089700047
Citation statistics
Cited Times:21[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/15980
Collection太阳和太阳系等离子体研究团组
Affiliation1.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
Recommended Citation
GB/T 7714
Zhao, J. S.,Wu, D. J.,Lu, J. Y.. KINETIC ALFVEN WAVES EXCITED BY OBLIQUE MAGNETOHYDRODYNAMIC ALFVEN WAVES IN CORONAL HOLES[J]. ASTROPHYSICAL JOURNAL,2011,735(2).
APA Zhao, J. S.,Wu, D. J.,&Lu, J. Y..(2011).KINETIC ALFVEN WAVES EXCITED BY OBLIQUE MAGNETOHYDRODYNAMIC ALFVEN WAVES IN CORONAL HOLES.ASTROPHYSICAL JOURNAL,735(2).
MLA Zhao, J. S.,et al."KINETIC ALFVEN WAVES EXCITED BY OBLIQUE MAGNETOHYDRODYNAMIC ALFVEN WAVES IN CORONAL HOLES".ASTROPHYSICAL JOURNAL 735.2(2011).
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