Theory of solar wind turbulence with scale-dependent alignment, anisotropy, and cross-helicity

被引：4
|
作者：
Podesta, J. J. [1 ]
机构：
[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
来源：
TWELFTH INTERNATIONAL SOLAR WIND CONFERENCE | 2010年 / 1216卷
关键词：
magnetohydrodynamics; turbulence; solar wind; MAGNETOHYDRODYNAMIC TURBULENCE; FLUCTUATIONS; VELOCITY;
D O I：
10.1063/1.3395814
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
A theory of incompressible MHD turbulence with nonvanishing cross-helicity is derived based on two new observations from the Wind spacecraft. The first is the observation that the normalized cross-helicity sigma(c), is approximately scale-invariant throughout the inertial range. The second is the observation that the probabilities p and q for velocity and magnetic field fluctuations to be positively or negatively aligned are also approximately scale-invariant. The theory extends the theory of Boldyrev (2006) to turbulence with nonvanishing cross-helicity assuming that the cascades of the two Elsasser energies are both in a state of critical balance.
引用
收藏
页码：115 / 119
页数：5
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