动力学等离子体Turbulence的二维混合模拟：电流和涡度随质子温度的变化
Two-dimensional Hybrid Simulations of Kinetic Plasma Turbulence: Current and Vorticity vs Proton Temperature
摘要：
在太阳风等离子体中，质子温度在平行于和垂直于平均磁场的方向上存在各向异性。在这里，我们采用了高分辨率的混合粒子在细胞模拟，以调查质子温度的空间特性和电流密度的峰值和流动涡度之间的关系。我们的研究结果表明，虽然质子温度增强和温度各向异性较大的区域大致对应于许多薄电流片形成的区域，但没有确凿的定量证据支持这两种现象之间存在直接因果关系的想法。另一方面，质子温度的行为和离面涡度之间的关系是相当清楚的。
英文摘要：
Proton temperature anisotropies between the directions parallel and perpendicular to the mean magnetic field are usually observed in the solar wind plasma. Here, we employ a high-resolution hybrid particle-in-cell simulation in order to investigate the relation between spatial properties of the proton temperature and the peaks in the current density and in the flow vorticity. Our results indicate that, although regions where the proton temperature is enhanced and temperature anisotropies are larger correspond approximately to regions where many thin current sheets form, no firm quantitative evidence supports the idea of a direct causality between the two phenomena. On the other hand, quite a clear correlation between the behavior of the proton temperature and the out-of-plane vorticity is obtained.
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