太阳内部流动的高分辨率绘图：日震旅行时间的完全一致的OLA反演
High-resolution mapping of flows in the solar interior: Fully consistent OLA inversion of helioseismic travel times
摘要：
为了恢复时距日震走时数据中编码的流动信息，需要精确的正演模拟和走时的鲁棒反演。我们实现这一点，使用三维有限频率的走时灵敏度内核的流量与2+1维（2+1D）最佳本地化平均（OLA）反演方案。通过脊滤波MDI全圆盘多普勒数据测量旅行时间，并针对这些特定的旅行时间计算相应的Born灵敏度核。我们还利用旅行时间的全噪声协方差特性，这使我们能够准确地估计所有反演的误差。因此，整个程序完全一致。由于脊滤波，核函数在水平和垂直方向上分离，促使我们选择2+1D反演实现。反演过程还最小化了三个流分量之间的串扰效应，并且从反演得到的平均核显示出非常少量的串扰。我们获得三维地图的矢量太阳能流在安静的太阳在空间分辨率为7-10毫米，一般使用24小时的数据。对于所有的流图，我们提供平均内核和噪声估计。我们提出的例子来测试推断的流量，如与多普勒数据的比较，在其中，我们找到了0.9的相关性。我们还提出了结果安静的太阳超颗粒流在不同深度的上部对流区。
英文摘要：
To recover the flow information encoded in travel-time data of time-distance helioseismology, accurate forward modeling and a robust inversion of the travel times are required. We accomplish this using three-dimensional finite-frequency travel-time sensitivity kernels for flows along with a 2+1 dimensional (2+1D) optimally localized averaging (OLA) inversion scheme. Travel times are measured by ridge filtering MDI full-disk Doppler data and the corresponding Born sensitivity kernels are computed for these particular travel times. We also utilize the full noise covariance properties of the travel times which allow us to accurately estimate the errors for all inversions. The whole procedure is thus fully consistent. Due to ridge filtering, the kernel functions separate in the horizontal and vertical directions, motivating our choice of a 2+1D inversion implementation. The inversion procedure also minimizes cross-talk effects among the three flow components, and the averaging kernels resulting from the inversion show very small amounts of cross-talk. We obtain three-dimensional maps of vector solar flows in the quiet Sun at spatial resolutions of 7-10 Mm using generally 24 h of data. For all of the flow maps we provide averaging kernels and the noise estimates. We present examples to test the inferred flows, such as a comparison with Doppler data, in which we find a correlation of 0.9. We also present results for quiet-Sun supergranular flows at different depths in the upper convection zone.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
