| 利用EUV模拟观测和CT方法重建均匀等离子体层全球密度分布——三维ART重建和地球遮挡效应研究 |
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| 引用本文： | 金鑫,李亮,陈志强,徐荣栏,黄娅,张丽.利用EUV模拟观测和CT方法重建均匀等离子体层全球密度分布——三维ART重建和地球遮挡效应研究[J].地球物理学报,2011,54(7):1691-1700. |
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| 作者姓名： | 金鑫 李亮 陈志强 徐荣栏 黄娅 张丽 |
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| 作者单位： | 1. 清华大学工程物理系,北京 100084;
2. 粒子技术与辐射成像教育部重点实验室(清华大学),北京 100084;
3. 中国科学院空间科学与应用研究中心,北京 100080 |
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| 摘 要： | 本文对地球等离子体层和电离层进行了三维建模,并模拟卫星对30.4 nm极紫外线的探测过程,取得圆轨道平行束情况下的投影数据.采用改进的ART算法对所得数据进行三维重建,获得等离子体层的空间密度分布.结果表明,在投影角度覆盖180°的情况下,重建结果很好地再现了模型中空间各点的数值.文章对实验结果从CT重建方法的角度进行...
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| 关 键 词： | CT 三维平行束重建 ART迭代 地球遮挡问题 |
| 收稿时间： | 2010-09-19 |
Deduction of the global density of plasmasphere reconstructed from the EUV images using CT method 2.Three dimensional parallel-beam ART reconstruction |
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| JIN Xin,LI Liang,CHEN Zhi-Qiang,XU Rong-Lan,HUANG Ya,ZHANG Li.Deduction of the global density of plasmasphere reconstructed from the EUV images using CT method 2.Three dimensional parallel-beam ART reconstruction[J].Chinese Journal of Geophysics,2011,54(7):1691-1700. |
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| Authors: | JIN Xin LI Liang CHEN Zhi-Qiang XU Rong-Lan HUANG Ya ZHANG Li |
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| Institution: | 1. Department of Engineering Physics, Tsinghua University, Beijing 100084, China;
2. Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084, China;
3. Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | In this paper we built up a three dimensional model for the density distribution of earth plasmasphere. According to the physical procedure of 30.4 nm EUV detection, a numerical method was proposed which simulates the satellite imaging the plasmasphere along a circular orbit. To reconstruct the density distribution in such occasion a modified ART reconstruction method was worked out. Results showed that our method reconstructs the model very well. |
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| Keywords: | CT Three dimensional parallel-beam reconstruction ART iterative method Shelter problem |
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