A new inversion method for reconstruction of plasmaspheric He+ density from EUV images

A new inversion method for reconstruction of plasmaspheric He+ density from EUV images
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一种从 EUV 图像重建等离子体层 He 密度的新反演方法

DOI:
10.26464/epp2021020
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发表时间:
2021-03
期刊:
Earth Planet. Phys.
影响因子:
--
通讯作者:
Liang Li
Liang Li
中科院分区:
其他
文献类型:
--
作者:
Ya Huang;Lei Dai;Chi Wang;RongLan Xu;Liang Li

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计算机断层扫描(CT)方法用于遥感地球等离子体层。图像重建面临的挑战之一是投影数据不足,这主要是由于投影角度有限造成的。在本研究中,我们应用代数重建技术(ART)和图像总变差最小化(TV)方法,结合南北对称性的先验知识,从模拟的 EUV 图像中重建等离子体层 He+ 密度。结果表明,当投影数据不足时,结合先验假设尤其有用。即使投影角度小于150度,该方法也具有良好的性能。我们的研究方法预计将应用于太阳风磁层电离层链接探索者(SMILE)任务的软X射线成像仪(SXI)重建。
The Computer Tomography (CT) method is used for remote sensing the Earth's plasmasphere. One challenge for image reconstruction is insufficient projection data, mainly caused by limited projection angles. In this study, we apply the Algebraic Reconstruction Technique (ART) and the minimization of the image Total Variation (TV) method, with a combination of priori knowledge of north‐south symmetry, to reconstruct plasmaspheric He+ density from simulated EUV images. The results demonstrate that incorporating priori assumption can be particularly useful when the projection data is insufficient. This method has good performance even with a projection angle of less than 150 degrees. The method of our study is expected to have applications in the Soft X‐ray Imager (SXI) reconstruction for the Solar wind‐Magnetosphere‐Ionosphere Link Explorer (SMILE) mission.
使用 EUV 辐射数据的计算机断层扫描方法研究等离子体层密度分布
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