DeGrave K, Braun D C, Birch A C, Crouch A D, Javornik B
NorthWest Research Associates, 3380 Mitchell Lane, Boulder, CO 80301, USA.
Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, Germany.
Astrophys J. 2018 Aug 10;863(1). doi: 10.3847/1538-4357/aacffd.
Here we use synthetic data to explore the performance of forward models and inverse methods for helioseismic holography. Specifically, this work presents the first comprehensive test of inverse modeling for flows using lateral-vantage (deep-focus) holography. We derive sensitivity functions in the Born approximation. We then use these sensitivity functions in a series of forward models and inversions of flows from a publicly available magnetohydrodynamic quiet-Sun simulation. The forward travel times computed using the kernels generally compare favorably with measurements obtained by applying holography, in a lateral-vantage configuration, on a 15-hour time series of artificial Dopplergrams extracted from the simulation. Inversions for the horizontal flow components are able to reproduce the flows in the upper 3Mm of the domain, but are compromised by noise at greater depths.
在此，我们使用合成数据来探索日震全息术的正演模型和反演方法的性能。具体而言，这项工作展示了首次使用侧向优势（深聚焦）全息术对流动进行反演建模的全面测试。我们在玻恩近似下推导灵敏度函数。然后，我们在一系列正演模型中使用这些灵敏度函数，并对来自公开可用的磁流体动力学宁静太阳模拟的流动进行反演。使用这些核计算得到的正演传播时间通常与通过在侧向优势配置下对从模拟中提取的15小时人工多普勒图时间序列应用全息术所获得的测量结果相当。对水平流动分量的反演能够再现该区域上部3Mm的流动，但在更深的深度会受到噪声的影响。
