Numerical study of ion-cyclotron resonant interaction via hybrid-Vlasov simulations
Numerical study of ion-cyclotron resonant interaction via hybrid-Vlasov simulations
复制标题
通过混合 Vlasov 模拟进行离子回旋共振相互作用的数值研究
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
P. Veltri
中科院分区：
文献类型：
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作者：
F. Valentini;A. Iazzolino;P. Veltri
用混合Vlasov-Maxwell数值模拟方法研究了离子与离子回旋波在背景磁场中平行传播时的无碰撞共振相互作用。在线性情况下，通过熟知特征线性化的Vlasov方程积分得到的波阻尼解与数值结果进行了比较。然后，对离子加热过程及其在垂直于背景磁场方向的温度各向异性的产生进行了详细的数值研究。数值结果表明，在非线性区，由于离子-回旋共振相互作用，在纵向(相对于环境场)形成扩散平台，粒子速度分布发生强烈扭曲，并明显偏离麦克斯韦平衡。这些结果在许多等离子体物理环境中都是相关的，例如太阳风，在那里...
Hybrid Vlasov–Maxwell numerical simulations are used to investigate the collisionless resonant interaction of ions with ion-cyclotron waves in parallel propagation with respect to a background magnetic field. In linear regime, analytical results on wave damping, obtained by integrating the linearized Vlasov equation through the well-known characteristics method, are compared with the numerical results. Then, the ion heating process and the consequent generation of temperature anisotropy in the direction perpendicular to the background magnetic field are investigated numerically in detail. In nonlinear regime, the numerical results show that the distribution of particle velocities is strongly distorted due to the resonant ion-cyclotron interaction with the formation of diffusive plateaus in the longitudinal direction (with respect to the ambient field) and significantly departs from the Maxwellian equilibrium. These results are relevant in many plasma physics environments, such as the solar wind, where the...