SPECTRUM OF KINETIC-ALFVEN TURBULENCE

被引：157

作者：

Boldyrev, Stanislav ^{[1
]}

Perez, Jean Carlos ^{[1
,2
,3
]}

机构：

[1] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA

[2] Univ New Hampshire, Ctr Space Sci, Durham, NH 03824 USA

[3] Univ New Hampshire, Dept Phys, Durham, NH 03824 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2012年 / 758卷 / 02期

基金：

美国国家科学基金会;

关键词：

magnetic fields; magnetohydrodynamics (MHD); solar wind; turbulence; ELECTRON MAGNETOHYDRODYNAMIC TURBULENCE; WAVE TURBULENCE; SOLAR-WIND; ASTROPHYSICAL GYROKINETICS; MAGNETIC FLUCTUATIONS; DENSITY; PLASMAS;

D O I：

10.1088/2041-8205/758/2/L44

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A numerical study of strong kinetic-Alfven turbulence at scales smaller than the ion gyroscale is presented, and a phenomenological model is proposed that argues that magnetic and density fluctuations are concentrated mostly in two-dimensional structures, which leads to their Fourier energy spectra E(k(perpendicular to)) alpha k(perpendicular to)(-8/3), where k(perpendicular to) is the wavevector component normal to the strong background magnetic field. The results may provide an explanation for recent observations of magnetic and density fluctuations in the solar wind at sub-proton scales.

引用

页数：5

共 35 条

[1] Universality of Solar-Wind Turbulent Spectrum from MHD to Electron Scales [J].