The solar surface is a continuous source of internal gravity waves (IGWs). IGWs are believed to supply the bulk of the wave energy for the lower solar atmosphere, but their existence and role for the energy balance of the upper layers is still unclear, largely due to the lack of knowledge about the influence of the Sun’s magnetic fields on their propagation. In this work, we look at naturally excited IGWs in realistic models of the solar atmosphere and study the effect of different magnetic field topographies on their propagation. We carry out radiation-magnetohydrodynamic simulations of a magnetic field free and two magnetic models—one with an initial, homogeneous, vertical field of 100 G magnetic flux density and one with an initial horizontal field of 100 G flux density. The propagation properties of IGWs are studied by examining the phase-difference and coherence spectra in the kh − ω diagnostic diagram. We find that IGWs in the upper solar atmosphere show upward propagation in the model with predominantly horizontal field similar to the model without magnetic field. In contrast to that the model with predominantly vertical fields show downward propagation. This crucial difference in the propagation direction is also revealed in the difference in energy transported by waves for heights below 0.8 Mm. Higher up, the propagation properties show a peculiar behaviour, which require further study. Our analysis suggests that IGWs may play a significant role in the heating of the chromospheric layers of the internetwork region where horizontal fields are thought to be prevalent. This article is part of the Theo Murphy meeting issue ‘High-resolution wave dynamics in the lower solar atmosphere’.

中文翻译：

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磁拓扑对太阳大气内部重力波传播的影响

太阳表面是内部重力波（IGW）的连续源。IGW 被认为为低层太阳大气提供了大部分波浪能，但它们的存在和对上层能量平衡的作用仍不清楚，这主要是由于缺乏关于太阳磁场对太阳磁场影响的知识。他们的传播。在这项工作中，我们在太阳大气的真实模型中观察自然激发的 IGW，并研究不同磁场拓扑对其传播的影响。我们对无磁场和两个磁模型进行了辐射磁流体动力学模拟——一个具有 100 G 磁通量密度的初始均匀垂直场，一个具有 100 G 磁通量密度的初始水平场。通过检查 kh - ω 诊断图中的相位差和相干谱来研究 IGW 的传播特性。我们发现上层太阳大气中的 IGW 在模型中显示出向上传播，其中主要是水平场，类似于没有磁场的模型。与此相反，具有主要垂直场的模型显示向下传播。传播方向的这一关键差异也体现在 0.8 毫米以下高度的波传输的能量差异中。在更高的地方，传播特性表现出一种特殊的行为，需要进一步研究。我们的分析表明，IGW 可能在水平场普遍存在的互联网络区域的色球层加热中发挥重要作用。