Planar acoustically dominated magnetohydrodynamic waves are initiated at the high-\(\beta\) base of a simulated 2D isothermal stratified atmosphere with potential magnetic field exhibiting both open and closed field regions as well as neutral points. They shock on their way upward toward the Alfvén–acoustic equipartition surface \(a=c\), where \(a\) and \(c\) are the Alfvén and sound speeds, respectively. Expanding on recent 1.5D findings that such shocks mode-convert to fast shocks and slow smoothed waves on passing through \(a=c\), we explore the implications for these more complex magnetic geometries. It is found that the 1.5D behaviour carries over to the more complex case, with the fast shocks strongly attracted to neutral points, which are disrupted producing extensive fine structure. It is also observed that shocks moving in the opposite direction, from \(a>c\) to \(a< c\), split into fast and slow components too, and that again it is the slow component that is smoothed.

平面声学主导的磁流体动力波在模拟 2D 等温分层大气的高\(\beta\)基部发起，潜在磁场显示开放和封闭场区域以及中性点。它们在向上朝向 Alfvén-声学均分面\(a=c\) 的过程中受到冲击，其中\(a\)和\(c\)分别是 Alfvén 和声速。扩展最近的 1.5D 研究结果，即这种冲击模式在通过\(a=c\) 时转换为快速冲击和慢速平滑波，我们探讨了这些更复杂的磁几何结构的含义。发现 1.5D 行为延续到更复杂的情况，快速冲击强烈吸引到中性点，这些中性点被破坏产生广泛的精细结构。还观察到沿相反方向移动的冲击，从\(a>c\)到\(a< c\)，也分裂为快速和慢速分量，并且再次平滑的是慢速分量。