Validating Forward Modeling and Inversions of Helioseismic Holography Measurements

被引:3
作者
DeGrave, K. [1 ]
Braun, D. C. [1 ]
Birch, A. C. [2 ]
Crouch, A. D. [1 ]
Javornik, B. [1 ]
机构
[1] NorthWest Res Associates, 3380 Mitchell Lane, Boulder, CO 80301 USA
[2] Max Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany
基金
美国国家科学基金会;
关键词
methods: observational; Sun: helioseismology; Sun: interior; Sun: oscillations; TIME-DISTANCE HELIOSEISMOLOGY; SOUND-SPEED PERTURBATIONS; NUMERICAL SIMULATIONS; SEISMIC HOLOGRAPHY; SOLAR CONVECTION; ACTIVE REGIONS; TRAVEL-TIMES; FLOWS; SENSITIVITY; PROSPECTS;
D O I
10.3847/1538-4357/aacffd
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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 hr time series of artificial Dopplergrams extracted from the simulation. Inversions for the horizontal flow components are able to reproduce the flows in the upper 3 Mm of the domain, but are compromised by noise at greater depths.
引用
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页数:12
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