THERMAL DIAGNOSTICS WITH THE ATMOSPHERIC IMAGING ASSEMBLY ON BOARD THE SOLAR DYNAMICS OBSERVATORY: A VALIDATED METHOD FOR DIFFERENTIAL EMISSION MEASURE INVERSIONS
THERMAL DIAGNOSTICS WITH THE ATMOSPHERIC IMAGING ASSEMBLY ON BOARD THE SOLAR DYNAMICS OBSERVATORY: A VALIDATED METHOD FOR DIFFERENTIAL EMISSION MEASURE INVERSIONS
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DOI：
10.1088/0004-637x/807/2/143
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发表时间：
2015-07-10
影响因子：
4.9
通讯作者：
Malanushenko, A.
中科院分区：
文献类型：
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作者：
Cheung, Mark C. M.;Boerner, P.;Malanushenko, A.
我们提出了一种新的方法进行差分发射测量（DEM）反演的窄带EUV图像从大气成像组件（AIA）上的太阳动力学天文台。该方法通过求解一个线性规划得到正定DEM解。这种方法已被验证对不同的复杂性和现实的热模型的不同集合。这些包括（1）理想化的高斯DEM分布，（2）NOAA活动区11158的3D模型，包括非线性无力场中的准稳态环路大气，以及（3）来自完全可压缩的热力学模型，3D MHD模拟活动区（AR）在磁通量出现后的日冕形成。然后，我们提出的方法的应用AIA活动区11158的观测结果，比较两个连续的太阳旋转该地区的热结构。此外，我们展示了如何DEM反演方法可以适应同时反演AIA和日野X射线望远镜数据，以及如何补充AIA数据与后者提高了反演结果。该方法的速度允许DEM地图的日常制作，从而促进需要在时间和空间上跟踪日冕热结构的科学研究。
We present a new method for performing differential emission measure (DEM) inversions on narrow-band EUV images from the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory. The method yields positive definite DEM solutions by solving a linear program. This method has been validated against a diverse set of thermal models of varying complexity and realism. These include (1) idealized Gaussian DEM distributions, (2) 3D models of NOAA Active Region 11158 comprising quasi-steady loop atmospheres in a nonlinear force-free field, and (3) thermodynamic models from a fully compressible, 3D MHD simulation of active region (AR) corona formation following magnetic flux emergence. We then present results from the application of the method to AIA observations of Active Region 11158, comparing the region's thermal structure on two successive solar rotations. Additionally, we show how the DEM inversion method can be adapted to simultaneously invert AIA and Hinode X-ray Telescope data, and how supplementing AIA data with the latter improves the inversion result. The speed of the method allows for routine production of DEM maps, thus facilitating science studies that require tracking of the thermal structure of the solar corona in time and space.