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Saturation level of Alfven waves driven by Kelvin-Helmholtz instability
Chen, Ling1,2; Wu, Dejin1; Zhao, Guoqing1,3; Huang, Jing2
2014-10-01
Source PublicationCHINESE SCIENCE BULLETIN
ISSN1001-6538
Volume59Issue:28Pages:3536-3542
AbstractAlfv,n waves (AWs) can play an important role in the macroscopic dynamics as well as in the microscopic wave-particle interaction in various magneto-plasma environments. A very wide observed range of the relative amplitude of magnetic fluctuations of AWs from lower than 10(-3) in the terrestrial magnetosphere up to similar to 1 in the solar wind implies the complexity of saturation mechanisms of AWs. Taking account of the ion-neutral collision damping in a partially ionized plasma, the saturation level of AWs driven by the Kelvin-Helmholtz (K-H) instability is investigated in this paper. The intensified magnetic field due to the excited AWs may result in the saturation of the excited AWs when the growth rate is balanced by the damping rate. An equation determining the saturation level of the AWs is obtained. The results show that, for a fixed-frequency wave, the saturation level of the AWs considerably increases as the ionization degree increases as well as the sheared-flow velocity. On the other hand, for a fixed ionization degree the saturation level of the AWs slightly increases as the plasma beta increases but decreases as the wave frequency increases. These results have potential importance for us to estimate the saturation level of AWs in space and astrophysical plasmas.
KeywordMhd Plasmas Sun: Atmosphere Instability Waves
WOS HeadingsScience & Technology
DOI10.1007/s11434-014-0421-4
WOS KeywordMULTICOMPONENT SOLAR-WIND ; FIELD-ALIGNED CURRENTS ; DIFFERENTIAL ION FLOW ; MAGNETOHYDRODYNAMIC WAVES ; CORONAL HOLES ; MHD WAVES ; PLASMA ; CONSEQUENCES ; DISSIPATION ; PROPAGATION
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Indexed BySCI
Language英语
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
WOS IDWOS:000341837300004
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10637
Collection太阳和太阳系等离子体研究团组
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Key Lab Solar Act, Natl Astron Observ, Beijing 100012, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Chen, Ling,Wu, Dejin,Zhao, Guoqing,et al. Saturation level of Alfven waves driven by Kelvin-Helmholtz instability[J]. CHINESE SCIENCE BULLETIN,2014,59(28):3536-3542.
APA Chen, Ling,Wu, Dejin,Zhao, Guoqing,&Huang, Jing.(2014).Saturation level of Alfven waves driven by Kelvin-Helmholtz instability.CHINESE SCIENCE BULLETIN,59(28),3536-3542.
MLA Chen, Ling,et al."Saturation level of Alfven waves driven by Kelvin-Helmholtz instability".CHINESE SCIENCE BULLETIN 59.28(2014):3536-3542.
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