Application of generalized aurora computed tomography to the EISCAT_3D project

IF 1.7 4区 地球科学 Q3 ASTRONOMY & ASTROPHYSICS Annales Geophysicae Pub Date : 2024-05-29 DOI:10.5194/angeo-42-179-2024
Yoshimasa Tanaka, Yasunobu Ogawa, Akira Kadokura, Takehiko Aso, Björn Gustavsson, Urban Brändström, Tima Sergienko, Genta Ueno, Satoko Saita
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Abstract

Abstract. EISCAT_3D is a project to build a multi-site phased-array incoherent scatter radar system in northern Fenno-Scandinavia. We demonstrate via numerical simulation how useful monochromatic images taken by a multi-point imager network are for auroral research in the EISCAT_3D project. We apply the generalized aurora computed tomography (G-ACT) method to modelled observational data from real instruments, such as the Auroral Large Imaging System (ALIS) and the EISCAT_3D radar. G-ACT is a method for reconstructing the three-dimensional (3D) distribution of auroral emissions and ionospheric electron density (corresponding to the horizontal two-dimensional (2D) distribution of energy spectra of precipitating electrons) from multi-instrument data. It is assumed that the EISCAT_3D radar scans an area of 0.8° in geographic latitude and 3° in longitude at an altitude of 130 km with 10 × 10 beams from the radar core site at Skibotn (69.35° N, 20.37° E). Two neighboring discrete arcs are assumed to appear in the observation region of the EISCAT_3D radar. The reconstruction results from G-ACT are compared with those from the normal ACT as well as the ionospheric electron density from the radar. It is found that G-ACT can interpolate the ionospheric electron density at a much higher spatial resolution than that observed by the EISCAT_3D radar. Furthermore, the multiple arcs reconstructed by G-ACT are more precise than those by ACT. In particular, underestimation of the ionospheric electron density and precipitating electrons' energy fluxes inside the arcs is significantly improved by G-ACT including the EISCAT_3D data. Even when the ACT reconstruction is difficult due to the unsuitable locations of the imager sites relative to the discrete arcs and/or a small number of available images, G-ACT allows us to obtain better reconstruction results.
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将广义极光计算机断层扫描应用于 EISCAT_3D 项目
摘要EISCAT_3D 是一个在芬诺-斯堪的纳维亚半岛北部建立多站点相控阵非相干散射雷达系统的项目。我们通过数值模拟展示了多点成像器网络拍摄的单色图像对 EISCAT_3D 项目中的极光研究有多大作用。我们将广义极光计算机断层扫描(G-ACT)方法应用于来自极光大型成像系统(ALIS)和 EISCAT_3D 雷达等实际仪器的模拟观测数据。G-ACT 是一种从多仪器数据重建极光辐射和电离层电子密度三维分布(对应于沉淀电子能谱的水平二维分布)的方法。假定 EISCAT_3D 雷达从位于 Skibotn(北纬 69.35°,东经 20.37°)的雷达核心站点发出 10×10 波束,以 130 公里的高度扫描地理纬度为 0.8°、经度为 3°的区域。假定 EISCAT_3D 雷达观测区域内出现两个相邻的离散弧。将 G-ACT 的重建结果与普通 ACT 以及雷达电离层电子密度的重建结果进行了比较。结果发现,G-ACT 能够以比 EISCAT_3D 雷达观测到的高得多的空间分辨率对电离层电子密度进行内插。此外,G-ACT 重建的多重弧线比 ACT 重建的更为精确。特别是,包括 EISCAT_3D 数据在内的 G-ACT 大大改进了对电离层电子密度和弧内析出电子能量通量的低估。即使由于成像仪站点相对于离散弧的位置不合适和(或)可用图像数量较少而导致 ACT 重建困难,G-ACT 也能让我们获得更好的重建结果。
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来源期刊
Annales Geophysicae
Annales Geophysicae 地学-地球科学综合
CiteScore
4.30
自引率
0.00%
发文量
42
审稿时长
2 months
期刊介绍: Annales Geophysicae (ANGEO) is a not-for-profit international multi- and inter-disciplinary scientific open-access journal in the field of solar–terrestrial and planetary sciences. ANGEO publishes original articles and short communications (letters) on research of the Sun–Earth system, including the science of space weather, solar–terrestrial plasma physics, the Earth''s ionosphere and atmosphere, the magnetosphere, and the study of planets and planetary systems, the interaction between the different spheres of a planet, and the interaction across the planetary system. Topics range from space weathering, planetary magnetic field, and planetary interior and surface dynamics to the formation and evolution of planetary systems.
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