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COMPARISON OF TWO-FLUID AND GYROKINETIC MODELS FOR KINETIC ALFVEN WAVES IN SOLAR AND SPACE PLASMAS
Yang, L.1,2; Wu, D. J.1; Wang, S. J.2; Lee, L. C.3
2014-09-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume792Issue:1Pages:0
AbstractAn analytical comparative study of a two-fluid and a gyrokinetic model of kinetic Alfven waves (KAWs) is presented for various solar and space plasma environments. Based on the linear KAW dispersion relation for gyrokinetics (Howes et al. 2006), the wave group velocity and electromagnetic polarizations are obtained analytically. Then the gyrokinetic wave properties are compared with those of the two-fluid model. The results show that both models agree well with each other not only in the long wavelength regime (>> the ion gyroradius rho(i)) for all cases considered, but also in wavelengths similar to rho(i) and <> 1) ion/electron temperature ratio T-0i/T-0e, respectively. However, the fluid model calculations deviate strongly from the gyrokinetic model at scales < rho(i) for a relatively low T-0i/T-0e due to the electron gyroradius effect. Meanwhile, the plasma beta(i) can make the gyrokinetic dispersion relation of KAWs become complex and sometimes have an oscillation-like structure. With the inherent simplicity of the fluid theory, these results may improve our understanding of the applicability of the two-fluid model, and may have important implications for computer simulation studies of KAWs in the solar and space plasma surroundings.
KeywordMethods: Analytical Plasmas Waves
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/792/1/36
WOS KeywordWEAKLY COLLISIONAL PLASMAS ; ELECTRON ACCELERATION ; SURFACE-WAVES ; ASTROPHYSICAL GYROKINETICS ; HYDROMAGNETIC-WAVES ; WIND TURBULENCE ; CORONAL LOOPS ; HEAVY-IONS ; PARTICLE-ACCELERATION ; DISSIPATION RANGE
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Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000341172100036
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Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10639
Collection太阳和太阳系等离子体研究团组
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China
3.Acad Sinica, Inst Earth Sci, Taipei 115, Taiwan
Recommended Citation
GB/T 7714
Yang, L.,Wu, D. J.,Wang, S. J.,et al. COMPARISON OF TWO-FLUID AND GYROKINETIC MODELS FOR KINETIC ALFVEN WAVES IN SOLAR AND SPACE PLASMAS[J]. ASTROPHYSICAL JOURNAL,2014,792(1):0.
APA Yang, L.,Wu, D. J.,Wang, S. J.,&Lee, L. C..(2014).COMPARISON OF TWO-FLUID AND GYROKINETIC MODELS FOR KINETIC ALFVEN WAVES IN SOLAR AND SPACE PLASMAS.ASTROPHYSICAL JOURNAL,792(1),0.
MLA Yang, L.,et al."COMPARISON OF TWO-FLUID AND GYROKINETIC MODELS FOR KINETIC ALFVEN WAVES IN SOLAR AND SPACE PLASMAS".ASTROPHYSICAL JOURNAL 792.1(2014):0.
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