FIRST THREE-DIMENSIONAL RECONSTRUCTIONS OF CORONAL LOOPS WITH THE STEREO A+B SPACECRAFT. III. INSTANT STEREOSCOPIC TOMOGRAPHY OF ACTIVE REGIONS
FIRST THREE-DIMENSIONAL RECONSTRUCTIONS OF CORONAL LOOPS WITH THE STEREO A+B SPACECRAFT. III. INSTANT STEREOSCOPIC TOMOGRAPHY OF ACTIVE REGIONS
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DOI：
10.1088/0004-637x/695/1/12
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发表时间：
2009-04
期刊：
影响因子：
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通讯作者：
M. Aschwanden;J. Wuelser;N. Nitta;J. Lemen;A. Sandman
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作者：
M. Aschwanden;J. Wuelser;N. Nitta;J. Lemen;A. Sandman
在这里，我们开发了一种新的三维（3D）重建方法的冠状等离子体的活动区域相结合的立体三角测量的循环与密度和温度建模的冠状循环与填充因子相当于层析体绘制。由于这种方法只需要一个立体图像对在多个温度过滤器，这是采样在201分钟内与最近的STEREO/EUVI仪器，这种方法是约四个数量级的速度比传统的太阳旋转为基础的层析成像。我们重建的3D密度和温度分布的活动区域NOAA 10955的立体三角测量的70个循环，这是用来作为一个骨架的3D字段插值的一些7000个循环组件，导致一个3D模型，再现观察到的通量在每个立体图像对的精度的几个三分之一（平均通量）在每个像素。与立体断层扫描，我们还推断在整个温度范围内的T 104-107的差分发射测量分布，与软X射线的过渡区和较热的日冕的预测。断层摄影3D模型还提供物理参数的大量统计数据。我们发现，极端紫外线环的峰值温度Tm = 3.0 MK的倾向于超流体静力学，而更热的环Tm = 4-7 MK的近流体静力学。新的3D重建模型完全独立于任何磁场数据，并有望用于未来的理论磁场模型和日冕加热模型的测试。
Here we develop a novel three-dimensional (3D) reconstruction method of the coronal plasma of an active region by combining stereoscopic triangulation of loops with density and temperature modeling of coronal loops with a filling factor equivalent to tomographic volume rendering. Because this method requires only a stereoscopic image pair in multiple temperature filters, which are sampled within ≈1 minute with the recent STEREO/EUVI instrument, this method is about four orders of magnitude faster than conventional solar rotation-based tomography. We reconstruct the 3D density and temperature distribution of active region NOAA 10955 by stereoscopic triangulation of 70 loops, which are used as a skeleton for a 3D field interpolation of some 7000 loop components, leading to a 3D model that reproduces the observed fluxes in each stereoscopic image pair with an accuracy of a few percents (of the average flux) in each pixel. With the stereoscopic tomography we infer also a differential emission measure distribution over the entire temperature range of T ≈ 104–107, with predictions for the transition region and hotter corona in soft X-rays. The tomographic 3D model provides also large statistics of physical parameters. We find that the extreme-ultraviolet loops with apex temperatures of Tm ≲ 3.0 MK tend to be super-hydrostatic, while hotter loops with Tm ≈ 4–7 MK are near-hydrostatic. The new 3D reconstruction model is fully independent of any magnetic field data and is promising for future tests of theoretical magnetic field models and coronal heating models.