On the cosmic ray cross-field diffusion for solar wind turbulence
On the cosmic ray cross-field diffusion for solar wind turbulence
复制标题
太阳风湍流的宇宙线交叉场扩散
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
G. Michałek
中科院分区：
文献类型：
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作者：
G. Michałek
用蒙特卡罗粒子模拟方法研究了纯各向同性Alfven波、纯各向同性磁声波及其混合波存在下带电粒子的交叉场扩散系数。结果表明，交叉场扩散系数kappa_{perp}$强烈地依赖于假定的MHD湍流谱和振幅，而与所考虑的波的类型关系不大。结果表明，垂直于平均磁场的输运主要是由复合扩散决定的，复合扩散结合了磁性不规则性的散射效应和磁性编织效应。比率$kappa_{perp}/kappa_{parallel}D_{
m M}约{
m const.}$在所考虑的宽范围内与刚度无关。
The cross-field diffusion coefficient of charged particles in the presence of pure isotropic Alfven waves, pure isotropic magnetosonic waves and their mixture is considered using Monte Carlo particle simulations. We show that the cross-field diffusion coefficient $kappa_{perp}$ strongly depends on the assumed spectrum and amplitude of MHD turbulence but much less on the type of waves considered. It is demonstrated that transport perpendicular to the average magnetic field is mostly determined by compound diffusion which combines the effects of scattering off magnetic irregularities with magnetic braiding. The ratio $kappa_{perp}/kappa_{parallel}D_{
m M}approx {
m const.}$ is independent of rigidity over the wide range considered.