论文标题
太阳大气中两流体磁性波的数值模拟
Numerical Simulations of Two-Fluid Magnetoacoustic Waves in the Solar Atmosphere
论文作者
论文摘要
我们研究了部分离子化的下部太阳大气中的磁性两流体波的波周期，由离子（质子） +电子和中性（原子氢）流体组成，这些流体由离子 - 隔离碰撞耦合。该研究允许在太阳大气中找到波周期的截止及其变化，并确定这些临界值在确定波传播条件中的作用。大气由均匀的垂直磁场允许。我们在一维（1D）的两流体模型的框架中执行数值模拟，在该模型中，在垂直离子和中性速度中的谐波驱动器在太阳光谱的底部运行，平面波由谐波驱动器退出。除了直接由驾驶员设置的波，我们还观察到具有截止波周期的波的激发。我们还看到，该驾驶员退出的一些海浪可以到达太阳能电晕。尽管存在局限性，例如缺乏非绝热和非理想的项以及简单的1D结构，但开发的太阳大气的两流体模型却揭示了临界值在太阳大气中建立波浪传播条件的作用的新启示，并发现了可能从太阳能表面传播到corarona的波浪中的波动时期。
We study vertical variations of wave-periods of magnetoacoustic two-fluid waves in the partially ionized lower solar atmosphere, consisting of ion (proton) + electron and neutral (atomic hydrogen) fluids, which are coupled by ion-neutral collisions. The study allows finding the wave period cutoffs and their variations in the solar atmosphere, as well as establishing the role of these cutoffs in determining the wave propagation conditions. The atmosphere is permitted by a uniform vertical magnetic field. We perform numerical simulations in the framework of a one-dimensional (1D), two-fluid model in which plane waves are exited by a harmonic driver in the vertical ion and neutral velocities, operating at the bottom of the solar photosphere. We observe excitation of waves with cutoff wave-periods in addition to waves set directly by the driver. We also see that some waves exited by that driver can reach the solar corona. Despite of its limitations such as the lack of non-adiabatic and non-ideal terms and a simple 1D structure, the developed two-fluid model of the solar atmosphere sheds a new light on the role of cutoffs in setting up the wave propagation conditions in the solar atmosphere and finding periods of waves that may carry their energy from the solar surface to the corona.
