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MEASUREMENT OF INTERMITTENCY OF ANISOTROPIC MAGNETOHYDRODYNAMIC TURBULENCE IN HIGH-SPEED SOLAR WIND
Luo, Q. Y.; Wu, D. J.; Yang, L.
2011-06-01
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume733Issue:2Pages:L22(5pp)
AbstractWe investigate the intermittency of anisotropic magnetohydrodynamic (MHD) turbulence in high-speed solar wind. Using the data recorded by the Ulysses spacecraft, we apply the Castaing function to model the probability density functions of the fluctuating magnetic field and calculate the magnetic structure functions (SFs) S-p of the order p in the coordinates (r, Theta), with r being the length scale and Theta the direction of the local mean field. The scaling exponent zeta, from S-p(r, Theta) alpha r(zeta(p, Theta)), has an anomalous nonlinear dependence on p, implying the intermittent scaling of solar wind turbulence, which has been observed for decades. Furthermore, we study the anisotropy of solar wind turbulence introduced by the strong mean magnetic field. From S-p(Theta = 0) alpha S-p(Theta = pi/2), we obtain r perpendicular to alpha r(parallel to)(alpha p) with alpha(p) = zeta(parallel to)/zeta(perpendicular to) denoting the perpendicular-parallel spatial correlation of the moment of the pth order. For the magnetic field difference dB, we find alpha(2) = 1.78 +/- 0.26, consistent with recent theories and observations. However, when the contribution from the intermittent fluctuations begins to dominate the scaling, alpha is not a constant but increases with p, e.g., alpha(5) = 1.97 +/- 0.41 and alpha(8) approximate to 2.42 +/- 0.64. This complication of the perpendicular-parallel spatial correlation due to the intermittency raises new questions for MHD turbulence theory.
KeywordMagnetic Fields Magnetohydrodynamics (Mhd) Methods: Data Analysis Solar Wind Turbulence
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/2041-8205/733/2/L22
WOS KeywordALFVENIC TURBULENCE ; MAGNETIC-FIELD ; POWER SPECTRA ; FLUCTUATIONS ; ULYSSES ; DEPENDENCE
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000293135000006
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/4497
Collection太阳和太阳系等离子体研究团组
AffiliationChinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Luo, Q. Y.,Wu, D. J.,Yang, L.. MEASUREMENT OF INTERMITTENCY OF ANISOTROPIC MAGNETOHYDRODYNAMIC TURBULENCE IN HIGH-SPEED SOLAR WIND[J]. ASTROPHYSICAL JOURNAL LETTERS,2011,733(2):L22(5pp).
APA Luo, Q. Y.,Wu, D. J.,&Yang, L..(2011).MEASUREMENT OF INTERMITTENCY OF ANISOTROPIC MAGNETOHYDRODYNAMIC TURBULENCE IN HIGH-SPEED SOLAR WIND.ASTROPHYSICAL JOURNAL LETTERS,733(2),L22(5pp).
MLA Luo, Q. Y.,et al."MEASUREMENT OF INTERMITTENCY OF ANISOTROPIC MAGNETOHYDRODYNAMIC TURBULENCE IN HIGH-SPEED SOLAR WIND".ASTROPHYSICAL JOURNAL LETTERS 733.2(2011):L22(5pp).
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