MEASUREMENT OF INTERMITTENCY OF ANISOTROPIC MAGNETOHYDRODYNAMIC TURBULENCE IN HIGH-SPEED SOLAR WIND

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 太阳和太阳系等离子体研究团组

	MEASUREMENT OF INTERMITTENCY OF ANISOTROPIC MAGNETOHYDRODYNAMIC TURBULENCE IN HIGH-SPEED SOLAR WIND
	Luo, Q. Y.; Wu, D. J.; Yang, L.
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2011-06-01
卷号	733 期号:2 页码:L22(5pp)
关键词	magnetic fields magnetohydrodynamics (MHD) methods: data analysis solar wind turbulence
ISSN号	2041-8205
英文摘要	We 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.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	ALFVENIC TURBULENCE ; MAGNETIC-FIELD ; POWER SPECTRA ; FLUCTUATIONS ; ULYSSES ; DEPENDENCE
收录类别	SCI
语种	英语
WOS记录号	WOS:000293135000006
公开日期	2012-08-07
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/4497]
专题	紫金山天文台_太阳和太阳系等离子体研究团组
作者单位	Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
推荐引用方式 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).