论文标题
在安静的太阳的3D磁传输模拟中,大厅和双极效应的联合作用。 I.波浪的耗散和产生
Joint action of Hall and ambipolar effects in 3D magneto-convection simulations of the quiet Sun. I. Dissipation and generation of waves
论文作者
论文摘要
太阳等离子体的部分电离会引起几种非理想效应,例如双极扩散,霍尔效应和比尔曼电池效应。在这里,我们报告了太阳能局部发电机的第一个三维现实模拟,并考虑了所有三个效果。模拟始于已经饱和的电池种子发电机的快照,其中开发了两个新系列:一个单独使用双极扩散,另一个也考虑到了广义欧姆定律中的霍尔术语。然后将模拟运行约4个小时的太阳能时间以达到固定状态并改善统计数据。同时,还可以在相同的时间内运行纯MHD Dynamo模拟。模拟以统计方式进行比较。结果表明,随着双极扩散的包含,与Alfven波相关的不可压缩扰动的幅度减少了,并以频率依赖性吸收了Poynting Flux。霍尔效应引起了相反的作用:产生了明显过量的不可压缩扰动,并且在色层层中观察到过多的po液通量。具有双极扩散的模型平均表明,在色球球体中,平均而言,电流板和更丰富的快速磁性冲击。具有大厅效应的模型在较低的染色体上具有较高的温度,并且在整个染色体上都更强,更垂直的磁场浓度。对高频波的研究表明,不可压缩的扰动的显着功率与具有强烈和垂直磁场和更大温度的区域有关。我们发现在10^2秒的特征时间后,双极加热的大小与同一位置的温度升高之间存在正相关。
The partial ionization of the solar plasma causes several nonideal effects such as the ambipolar diffusion, the Hall effect, and the Biermann battery effect. Here we report on the first three-dimensional realistic simulations of solar local dynamo where all three effects were taken into account. The simulations started with a snapshot of already saturated battery-seeded dynamo, where two new series were developed: one with solely ambipolar diffusion and another one also taking into account the Hall term in the generalized Ohm's law. The simulations were then run for about 4 hours of solar time to reach the stationary regime and improve the statistics. In parallel, a purely MHD dynamo simulation was also run for the same amount of time. The simulations are compared in a statistical way. The results show that, with the inclusion of the ambipolar diffusion, the amplitudes of the incompressible perturbations related to Alfven waves are reduced, and the Poynting flux is absorbed, with a frequency dependence. The Hall effect causes the opposite action: significant excess of incompressible perturbations is generated and an excess of the Poynting flux is observed in the chromospheric layers. The model with ambipolar diffusion shows, on average, sharper current sheets and slightly more abundant fast magneto-acoustic shocks in the chromosphere. The model with the Hall effect has higher temperatures at the lower chromosphere and stronger and more vertical magnetic field concentrations all over the chromosphere. The study of high-frequency waves reveals that significant power of incompressible perturbations is associated with areas with intense and more vertical magnetic fields and larger temperatures. We find a positive correlation between the magnitude of the ambipolar heating and the temperature increase at the same location after a characteristic time of 10^2 sec.