模拟太阳对流的日震全息照相术和探测小尺度地下流的前景
Helioseismic Holography of Simulated Solar Convection and Prospects for the Detection of Small-Scale Subsurface Flows
摘要：
我们进行日震全息现实的太阳对流模拟和比较所观察到的旅行时间的扰动与预期的旅行时间从水平流的模拟计算的假设下的玻恩近似的模型。我们证明了合理的协议之间的观测和模型的旅行时间，加强了日震全息在地下水平流的检测的有效性。从随深度的信噪比的变化，我们得出结论，日震探测的超颗粒或更小的空间尺度的个人流动结构是不可能的深度低于约5毫米以下的表面在时间尺度小于一天。大约一半的观测信号起源于地表以下的前2微米。这样做的一个后果是一个快速减少（和逆转在某些情况下）的走时扰动与深度由于相邻对流单体中的相反方向的表面流的测量的贡献。这证实了先前对观测报告的类似效应的解释。
英文摘要：
We perform helioseismic holography on realistic solar convection simulations and compare the observed travel-time perturbations with the expected travel times from the horizontal flows in the simulations computed from forward models under the assumption of the Born approximation. We demonstrate reasonable agreement between the observed and model travel times which reinforces the validity of helioseismic holography in the detection of subsurface horizontal flows. From the variation of the signal-to-noise ratio with depth, we conclude that the helioseismic detection of individual flow structures with spatial scales of supergranulation or smaller is not possible for depths below about 5 Mm below the surface over time scales less than a day. Approximately half of the observed signal originates within the first 2 Mm below the surface. A consequence of this is a rapid decrease (and reversal in some cases) of the travel-time perturbations with depth due to the contribution to the measurements of oppositely directed surface flows in neighboring convective cells. This confirms an earlier interpretation of similar effects reported from observations.
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