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

极光断层扫描是从多点CCD图像重建Aurora的3-D发光结构的反问题。在与瑞典太空物理学研究所的Alis光学观察网络进行了首次合作观察之前，我们一直在研究Functon拟合和代数MART方法的Auroral Stereoopsis。操纵多个图像。代数技术作为MART和SIRT具有统一的野外一致特征，其距离被认为是对有时不确定的极光断层扫描的限制。基于ra转换的分析方法也是研究的。 1995年12月，进行了观察，并通过改良的MART和…更多SIRT方法分析了到目前为止获得的各种类型的Aurora图像。对重建的独特性的研究也与分析同时研究了摄像机成像模型和亚素社会化的态度。鉴于基本形成过程和极光的动态行为，重建结构有助于定量研究。还继续针对各种反转算法进行进一步的数值测试。 1977年初，完全远程控制的Alis操作旨在与快速卫星和Eiscat Radar对Aurora进行连接研究。这些数据的全面分析仍在进行中。进行了层析成像分析，结果是在不同波长处的海拔高度曲线上进行了进一步的指示，沿着极光沿极高的高度分布以及涡流或多个弧的结构。还已经研究了通过集成球和重建结果的计算机可视化对摄像头特性的辐射校准对极光发射速率的绝对值。较少的

项目成果

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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）

Aso, T.: "First results of auroral tomography from ALIS-Japan multi-station observations in March, 1995" Earth, Planets and Space. 50 (1). 63-80 (1998)

Aso, T.：“1995 年 3 月 ALIS-Japan 多站观测的极光断层扫描的第一个结果”《地球、行星和空间》。