ENERGETIC PARTICLE DIFFUSION IN STRUCTURED TURBULENCE
ENERGETIC PARTICLE DIFFUSION IN STRUCTURED TURBULENCE
复制标题
DOI：
10.1088/0004-637x/749/2/103
复制
发表时间：
2012-02
期刊：
影响因子：
--
通讯作者：
T. Laitinen;S. Dalla;J. Kelly
中科院分区：
文献类型：
--
作者：
T. Laitinen;S. Dalla;J. Kelly
在等离子体中高能粒子输运的全轨道粒子模拟中，等离子体湍流通常被描述为线性傅立叶模的均匀叠加。然而，湍流的演变是一个典型的非线性过程，特别是在日光层的背景下，太阳风等离子体是不均匀的，由于瞬态结构，通过远程和原位测量观察。在这项工作中，我们研究的不均匀性对高能粒子输运的影响，通过使用空间分布，叠加湍流包络。我们发现，交叉场运输显着减少，当与均匀湍流得到的结果相比。当包络沿平均磁场方向沿着破坏波相位相干性时，这种减小可以达到一个数量级。
In the full-orbit particle simulations of energetic particle transport in plasmas, the plasma turbulence is typically described as a homogeneous superposition of linear Fourier modes. The turbulence evolution is, however, typically a nonlinear process, and, particularly in the heliospheric context, the solar wind plasma is inhomogeneous due to the transient structures, as observed by remote and in situ measurements. In this work, we study the effects of the inhomogeneities on energetic particle transport by using spatially distributed, superposed turbulence envelopes. We find that the cross-field transport is significantly reduced, when compared to the results obtained with homogeneous turbulence. The reduction can reach an order of magnitude when the enveloping breaks the wave phase coherence along the mean magnetic field direction.