太阳极紫外HeⅡ30.4 nm谱线层析成像及其光谱数据反演  

Tomographic imaging for solar extreme ultraviolet HeⅡ30.4 nm and spectral data inversion

作　　者：邢阳光 彭吉龙[2] 段紫雯 闫雷 李林[1] 刘越[1] Xing Yang-Guang;Peng Ji-Long;Duan Zi-Wen;Yan Lei;Li Lin;Liu Yue(School of Optoelectronic,Beijing Institute of Technology,Beijing 100081,China;Beijing Institute of Spacecraft Environment Engineering,Beijing 100094,China;Beijing Institute of Astronautical Systems Engineering,Beijing 100076,China)

机构地区：[1]北京理工大学光电学院,北京100081 [2]北京卫星环境工程研究所,北京100094 [3]北京宇航系统工程研究所,北京100076

出　　处：《物理学报》2022年第15期351-360,共10页Acta Physica Sinica

基　　金：中国科学院战略性先导科技专项(批准号:XDA15018300)资助的课题。

摘　　要：由磁场重联触发的发生在日冕和过渡区域上的具有高度动态的太阳爆发活动是灾害性空间天气的驱动源,对太阳爆发活动的空间成像和光谱分光测量是实现精准空间天气预报的关键数据来源.太阳大气上单离子氦的Lyman a跃迁产生波长30.4 nm的HeⅡ共振谱线,相比于邻近的谱线强度至少高一个数量级,因此能用来观测太阳爆发事件中的物质流动和能量输运过程.本文针对传统的太阳极紫外成像仪和成像光谱仪的缺陷,利用光线追迹方法设计了一款工作在HeⅡ30.4 nm波长处的二维光谱层析成像仪器,采用无狭缝的3个级次(–1,0,+1)同时衍射成像架构,单次快照可实现大视场的二维光谱瞬时成像.由于3个级次图像的空间信息和光谱信息混叠,利用有限层析投影角度的光谱数据反演算法,重构了观测目标的三维数据立方体Ⅰ(x,y,λ).Highly dynamic solar eruptive activities occurring over the corona and transition region,triggered off by magnetic field reconnection,are the driving source of disastrous space weather,and the space imaging and spectroscopic measurements of solar eruptive activities are a key data source for accurate space weather forecasting.The HeⅡ30.4 nm resonance line comes from the Lyman a transition of singly ionized helium,which has an anomalous intensity,an order of magnitude higher than the intensities of other transition region lines.In this paper,we propose and design a two-dimensional spectroscopic tomographic imaging instrument operating at HeⅡ30.4 nm wavelength to make up for the shortcomings of conventional solar extreme ultraviolet imager and imaging spectrometer,and adopt a slitless three-order(–1,0,+1)simultaneous diffraction imaging configuration with a single snapshot to achieve two-dimensional spectroscopy instantaneous imaging with a large field of view.Owing to the confusion of spatial and spectral information of the three orders of images,the three-dimensional data cubeⅠ(x,y,λ)of the observed target is reconstructed using a spectral data inversion algorithm with a limited tomographic projection angle.

关 键 词：太阳极紫外 层析成像 成像光谱仪 光谱数据反演 

分 类 号：P353[天文地球—空间物理学] P182[天文地球—地球物理学]