太阳羽流的时变三维重建方法及极紫外线资料的结果
A Time-Evolving 3D Method Dedicated to the Reconstruction of Solar plumes and Results Using Extreme Ultra-Violet Data
摘要：
在层析重建的太阳两极的一个重要问题是相对快速的演变极羽。我们证明，这是可能的，以考虑到这种时间的演变重建。这个问题的困难在于我们想要4D重建（三维空间加上时间），而我们只有3D数据（2D图像加上时间）。为了克服这个困难，我们引入了一个模型，描述极地羽流的强度随时间均匀变化的静止物体。如果人们接受磁结构的稳定性，这种假设在物理上是合理的。这个模型导致一个双线性逆问题。我们描述了如何将线性反演方法扩展到这类问题。仿真研究表明，我们的方法的可靠性。SOHO/EIT数据的结果表明，我们能够估计极地羽流的时间演变，以提高重建的太阳两极从一个角度来看。当两个探测器分开约60度时，我们预计STEREO/EUVI数据会有进一步的改进。
英文摘要：
An important issue in the tomographic reconstruction of the solar poles is the relatively rapid evolution of the polar plumes. We demonstrate that it is possible to take into account this temporal evolution in the reconstruction. The difficulty of this problem comes from the fact that we want a 4D reconstruction (three spatial dimensions plus time) while we only have 3D data (2D images plus time). To overcome this difficulty, we introduce a model that describes polar plumes as stationary objects whose intensity varies homogeneously with time. This assumption can be physically justified if one accepts the stability of the magnetic structure. This model leads to a bilinear inverse problem. We describe how to extend linear inversion methods to these kinds of problems. Studies of simulations show the reliability of our method. Results for SOHO/EIT data show that we are able to estimate the temporal evolution of polar plumes in order to improve the reconstruction of the solar poles from only one point of view. We expect further improvements from STEREO/EUVI data when the two probes will be separated by about 60 degrees.
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