A study on the auroral tomography analysis

极光断层扫描分析研究

基本信息

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

项目摘要

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

极光层析成像是从多点CCD图像重建极光3D发光结构的逆问题，在与瑞典研究所的ALIS光学观测网络进行首次合作观测之前，我们一直在通过函数拟合和代数MART方法研究极光立体观测。 1995年3月，空间物理学的“5点单色图像”实现，并开发出用于3D重建的层析反演代码，从立体成像升级程序，以及用于操纵多个图像的计算机用户界面，采用了在其附近的均匀场对准特性，假设为有时基于氡变换的不确定极光断层扫描的约束。 1995年12月进行了6点观测，并通过改进的MART和SIRT方法对迄今为止获得的各种类型的极光图像进行了分析。重建的独特性、相机成像模型的合理性和亚体素的复杂性也与分析同时进行，重建的结构有助于对极光的基本形成过程和动力学行为进行进一步的数值测试。 1977 年初，旨在对极光与 FAST 卫星和 EISCAT 雷达进行联合研究的完全远程控制 ALIS 操作仍在继续。正在进行断层扫描分析，根据不同波长的轮廓、沿极光的高度分布和涡旋或多弧的结构，通过使用相机特性的辐射校准来恢复极光进一步发射率的绝对值。积分球和重建结果的计算机可视化也得到了研究。