Deriving the Magnetopause Position from the Soft X‐Ray Image by Using the Tangent Fitting Approach
Deriving the Magnetopause Position from the Soft X‐Ray Image by Using the Tangent Fitting Approach
复制标题
DOI：
10.1029/2020ja028169
复制
发表时间：
2020-08
期刊：
影响因子：
--
通讯作者：
T. Sun;Chi Wang;H. Connor;A. Jorgensen;S. Sembay
中科院分区：
文献类型：
--
作者：
T. Sun;Chi Wang;H. Connor;A. Jorgensen;S. Sembay
成像技术是观测天文结构的基本技术之一。在分析观测图像时，从二维图像重建三维结构在许多科学领域都是一项挑战。本报告在从X射线图像重建地球磁层结构的背景下讨论了这一挑战，并提出了一种新技术。具体而言，它找到了从X射线图像得出的切线方向与参数化的磁层顶函数的最佳匹配。我们将这种方法命名为切线拟合方法（TFA）。基于对不同观测几何形状的X射线图像进行的磁流体动力学（MHD）模拟，进一步验证了TFA。TFA能够从单张X射线图像重建大尺度磁层顶，适用于诸如磁暴期间等随时间变化的情况。还需注意的是，TFA在遥感数据方面具有潜在的更广泛应用，例如高能中性原子（ENA）观测。最后，将这种新方法与其他磁层顶重建方法进行了比较。
Imaging is one of the essential techniques to observe astronomical structures. While analyzing the observed images, it is a challenge in many scientific fields to reconstruct the 3‐D structures from 2‐D image(s). This report discusses this challenge in the context of reconstructing the structure of the Earth's magnetosphere from the X‐ray image and presents a new technique. Specifically, it finds the optimum match of tangent directions derived from the X‐ray image and the parameterized magnetopause function. We name this approach as the tangent fitting approach (TFA). TFA is further validated based on the magnetohydrodynamic (MHD) simulations of the X‐ray images with different viewing geometries. TFA enables the reconstruction of the large‐scale magnetopause from a single X‐ray image, applicable to time‐dependent situations such as cases during magnetic storms. It is also noted that TFA has a potential broader application to remote sensing data, for instance, energetic neutral atom (ENA) observations. Lastly, this new approach is compared with other magnetopause reconstruction approaches.