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ISSN  2096-3955

CN  10-1502/P

Citation: Huang, Y., Dai, L., Wang, C., Xu, R. L. and Li, L. (2021). A new inversion method for reconstruction of plasmaspheric He+ density from EUV images. Earth Planet. Phys., 5(2), 218–222doi: 10.26464/epp2021020

2021, 5(2): 218-222. doi: 10.26464/epp2021020

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


State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China


Department of Engineering Physics, Tsinghua University, Beijing 100084, China

Corresponding author: Lei Dai,

Received Date: 2020-11-06
Web Publishing Date: 2021-03-01

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.

Key words: Earth plasmasphere He+ density, algebraic reconstruction technique, image total variation, north–south symmetry, SXI image reconstruction, SMILE mission

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

Ya Huang, Lei Dai, Chi Wang, RongLan Xu, Liang Li