A study on the auroral tomography analysis

极光断层扫描分析研究

• 批准号: 07640588
• 负责人: ASO Takehiko
• 金额: $ 1.47万
• 依托单位: National Institute of Polar Research (1997)Kyoto University (1995-1996)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07640588/
• 关键词: Aurora; Tomography; Monochromatic images; Inversion; MART; SIRT; ALIS; EISCAT; トモグラフィ; FAST; 多点観測; ラドン変換

Auroral tomography is an inverse problem to reconstruct 3-D luminous structure of aurora from multi-point CCD images. We had been studying auroral stereopsis by the functon fitting and algebraic MART methods before the first collaborative observations with ALIS optical observing network of the Swedish Institute of Space Physics came true and brought about 5-point monochromatic images in March, 1995. Tomographic inversion codes for 3-D reconstruction have since been developed, being upgraded from stereographic program, together with the computer user interface for manipulating multiple images. The algebraic techniques as the MART and SIRT were adapted with uniform field-aligned characteristic in its proximity assumed as a constraint to sometimes underdetermined auroral tomography. Analytic methods based on the Radon transform were also studied. In December 1995,6-point observation was carried out, and various types of aurora images obtained so far were analyzed by the modified MART and … More SIRT methods. Studies on the uniqueness of reconstruction.legitimacy of camera imaging models and sub-voxel sophistication were also worked out in parallel with the analysis. Reconstructed structure contributes to quantitative study in view of elementary formation process and dynamical behavior of auroras. Further numerical tests for various inversion algorithms were also continued. Fully remotely-controlled ALIS operation in early 1977 aimed at conjunctive studies of aurora with FAST satellite and EISCAT radar. Comprehensive analyzes of these data are still underway. Tomographic analysis has been undertaken with the result of further indications on the altitude profiles at different wavelength, stopping height distribution along aurora and structures of vortex or multiple arcs. Restoration of absolute value of auroral emission rate by the radiometric calibration of camera characteristics using an integration sphere and computer visualization of reconstructed results have also been investigated. Less

极光层析成像是利用多点CCD图像重建极光三维发光结构的逆问题。在1995年3月与瑞典空间物理研究所的ALIS光学观测网首次合作观测并获得5点单色图像之前，我们一直在用函数拟合和代数MART方法研究极光立体视。此后，开发了用于3D重建的层析成像反演代码，从立体成像程序升级，以及用于操作多个图像的计算机用户界面。代数技术的MART和SIRT的适应与均匀的场对准特性在其附近假设为约束，有时欠定极光层析成像。研究了基于Radon变换的解析方法。1995年12月，进行了6点观测，用改进的MART分析了迄今为止所获得的各种类型的极光图像， ...更多信息 SIRT方法。同时对重建的唯一性、摄像机成像模型的合理性和亚体素的精细化进行了研究。重建的结构有助于从极光的基本形成过程和动力学行为方面进行定量研究。还继续对各种反演算法进行进一步的数值试验。1977年初，全遥控ALIS运行，目的是与FAST卫星和EISCAT雷达联合研究极光。对这些数据的全面分析仍在进行中。通过层析分析，进一步揭示了不同波长的高度剖面、极光沿着的停止高度分布以及涡旋或多弧结构。还研究了利用积分球对照相机特性进行辐射定标来恢复极光发射率的绝对值，并对重建结果进行了计算机可视化。少

项目成果

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Aso,T.：“1995 年 3 月 26 日在 ALIS-Japan 多站活动中观察到的折叠弧的极光断层扫描分析”Proc.NIPR Symp.Upper Atmos.Phys.11。

Steen, Å.: "ALIS-A Multi-station imaging system at high latitude with multi-disciplinary scientific objectives" Proc.13th ESA Sympo.on European Rocket and Balloon Programs and related Research,Oland,Sweden,1997. ESA SP-397. 261-266 (1997)

Steen, Å.：“具有多学科科学目标的高纬度 ALIS-A 多站成像系统”Proc.13th ESA Sympo.on 欧洲火箭和气球计划及相关研究，瑞典奥兰，1997 年 ESA SP-397。 261-266（1997）

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Steen, A.: "ALIS-A Multi-station imaging system at high latitude with multi-disciplinary scientific objectives" Proc.13th ESA Symposium on European Rocket and Balloon Programs and related Research, Oland, Sweden, 26-29 May, 1997. ESA SP-397. 261-266 (1997

Steen, A.：“ALIS-A 具有多学科科学目标的高纬度多站成像系统”Proc.13th ESA 欧洲火箭和气球计划及相关研究研讨会，瑞典厄兰，1997 年 5 月 26-29 日。