声波在具有局部磁场集中的太阳光球下的传播：磁张力的影响
Acoustic wave propagation in the solar sub-photosphere with localised magnetic field concentration: effect of magnetic tension
摘要：
目标。在本文中，我们数值分析了声波的传播和分散在太阳的子光球与本地化的非均匀磁场浓度，模仿太阳黑子与各种代表性的磁场配置。方法.利用求解引力分层等离子体MHD方程的SAC方法，对波在具有局部磁场集中的太阳光球层下的传播进行了数值模拟。初始平衡密度和压力分层来自标准太阳模型。声波是由位于大约与太阳可见表面相对应的高度的源产生的。我们分析的垂直速度的变化的响应，由于磁场在相应的水平可见的太阳表面，通过当地的时间-距离日震学。结果本文给出了声波在太阳光球层下的传播和色散的数值模拟结果，这些结果具有不同类型的局部磁场浓度。可见太阳表面水平上的垂直速度扰动的时距图表明，磁场扰动和散射声波，吸收波包的声功率。对于弱磁化的情况，磁场的影响主要是热力学的，因为磁场改变了温度分层。然而，我们观察到的签名慢磁声模式，向下传播，强磁场的情况下。
英文摘要：
Aims. In this paper we analyse numerically the propagation and dispersion of acoustic waves in the solar-like sub-photosphere with localised non-uniform magnetic field concentrations, mimicking sunspots with various representative magnetic field configurations. Methods. Numerical simulations of wave propagation through the solar sub-photosphere with a localised magnetic field concentration are carried out using SAC, which solves the MHD equations for gravitationally stratified plasma. The initial equilibrium density and pressure stratifications are derived from a standard solar model. Acoustic waves are generated by a source located at the height approximately corresponding to the visible surface of the Sun. We analyse the response of vertical velocity to changes in the interior due to magnetic field at the level corresponding to the visible solar surface, by the means of local time-distance helioseismology. Results. The results of numerical simulations of acoustic wave propagation and dispersion in the solar sub-photosphere with localised magnetic field concentrations of various types are presented. Time-distance diagrams of the vertical velocity perturbation at the level corresponding to the visible solar surface show that the magnetic field perturbs and scatters acoustic waves and absorbs the acoustic power of the wave packet. For the weakly magnetised case the effect of magnetic field is mainly thermodynamic, since the magnetic field changes the temperature stratification. However, we observe the signature of slow magnetoacoustic mode, propagating downwards, for the strong magnetic field cases.
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