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首页> 外文期刊>Nonlinear processes in geophysics >Alfv?en wave filamentation and dispersive phase mixing in a high-density channel: Landau fluid and hybrid simulations
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Alfv?en wave filamentation and dispersive phase mixing in a high-density channel: Landau fluid and hybrid simulations

机译：高密度通道中的Alfv？en波丝化和分散相混合：Landau流体和混合模拟

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摘要

The propagation of dispersive Alfv?en waves in a low-beta collisionless plasma with a high-density channel aligned with the ambient magnetic field, is studied in three space dimensions. A fluid model retaining linear Landau damping and finite Larmor radius corrections is used, together with a hybrid particle-in-cell simulation aimed to validate the predictions of this Landau-fluid model. It is shown that when the density enhancement is moderate (depending on the pump wavelength and the plasma parameters), the wave energy concentrates into a filament whose transverse size is prescribed by the dimension of the channel. In contrast, in the case of a stronger density perturbation, the early formation of a magnetic filament is followed by the onset of thin helical ribbons and the development of strong gradients. This "dispersive phase mixing" provides a mechanism permitting dissipation processes (not included in the present model) to act and heat the plasma.
机译：在三个空间维度上研究了在具有高密度通道的低β无碰撞等离子体中的色散Alfven波的传播。使用保留线性Landau阻尼和有限拉莫尔半径校正的流体模型，以及旨在验证该Landau-流体模型的预测的混合单元中粒子模拟。结果表明，当密度增加适度时（取决于泵浦波长和等离子体参数），波能会聚到一根细丝中，细丝的横向尺寸由通道的尺寸确定。相比之下，在密度扰动更强的情况下，磁丝的早期形成会伴随着薄螺旋带的出现和强梯度的形成。这种“分散相混合”提供了一种机制，允许耗散过程（不包括在本模型中）作用并加热等离子体。

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