A new inversion method for reconstruction of plasmaspheric He^(+)density from EUV images  

作　　者：Ya Huang Lei Dai Chi Wang RongLan Xu Liang Li 

机构地区：[1]State Key Laboratory of Space Weather,National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China [2]Department of Engineering Physics,Tsinghua University,Beijing 100084,China

出　　处：《Earth and Planetary Physics》2021年第2期218-222,共5页地球与行星物理（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41904148,41731070,41874175);in part by the Strategic Priority Program on Space Science,Chinese Academy of Sciences(Grant Nos.XDA15017000,XDA15350201,XDA15052500).

摘　　要：The Computer Tomography(CT)method is used for remote sensing the Earth’s plasmasphere.One challenge for image reconstruction is insufficient projection data,mainly caused by limited projection angles.In this study,we apply the Algebraic Reconstruction Technique(ART)and the minimization of the image Total Variation(TV)method,with a combination of priori knowledge of north–south symmetry,to reconstruct plasmaspheric He+density from simulated EUV images.The results demonstrate that incorporating priori assumption can be particularly useful when the projection data is insufficient.This method has good performance even with a projection angle of less than 150 degrees.The method of our study is expected to have applications in the Soft X-ray Imager(SXI)reconstruction for the Solar wind–Magnetosphere–Ionosphere Link Explorer(SMILE)mission.

关 键 词：Earth plasmasphere He+density algebraic reconstruction technique image total variation north–south symmetry SXI image reconstruction SMILE mission 

分 类 号：P35[天文地球—空间物理学]