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

Abstract

Present a new method to reconstruct the plasmaspheric He + global density distribution from two dimensional Extreme Ultraviolet images. q The new method has superior performance with insufficient projection data. q The method can be generalized to study soft X-ray images from the Solar wind-Magnetosphere-Ionosphere Link Explorer mission.

Tomographic reconstruction of the Earth’s magnetosheath from multiple spacecraft: a theoretical study

“…For more details of how this algorithm is implemented the reader is referred to Chambolle (2004), as well as to our earlier paper. In addition to the theoretical work by Huang Y et al (2021), which inspired the present work, tomographic reconstruction has also been applied to real space plasma observations, including those of Gustavsson (1998) and Aso et al (1998).…”

“…Our first step in analyzing soft X-ray emissions consisted of various fitting approaches to volume emissions or to boundaries determined in the images (Jorgensen et al, 2019;Sun TR et al, 2020. The next step, following the example of Huang Y et al (2021), was to investigate superposed epoch tomographic reconstruction of the magnetosheath using modeled observations from the Solar Wind Magnetosphere Ionosphere Link Explorer (SMILE) satellite (Wang C et al, 2017;Branduardi-Raymont et al, 2018). This work is detailed in Jorgensen et al (2022), and a summary can also be found in Wang C and Sun TR (2022).…”

A Theoretical Study of the Tomographic Reconstruction of Magnetosheath X‐Ray Emissions

“…Tomographic techniques have previously been used in reconstructing the 3D shape of auroral formations (e.g., Aso et al., 1998; Gustavsson, 1998), and Huang et al. (2021) published an approach to reconstructing the plasmasphere from EUV images. The paper by Boone and McCollough (2021) discusses the history of medical tomography since it was initially developed 50 years ago.…”

“…These techniques are collectively referred to as tomographic techniques. Tomographic techniques have previously been used in reconstructing the 3D shape of auroral formations (e.g., Aso et al, 1998;Gustavsson, 1998), and Huang et al (2021) published an approach to reconstructing the plasmasphere from EUV images. The paper by Boone and McCollough (2021) discusses the history of medical tomography since it was initially developed In the following section, Section 2, we provide a brief general introduction to tomographic techniques, and then discuss how we apply them to imaging of X-ray emissions.…”

A machine learning-based electron density (MLED) model in the inner magnetosphere

“…The plasmasphere is composed of low-energy particles, forming a sphere-like reservoir of very cold (~1 eV), fairly dense plasma (~50−10 4 cm −3 ) that corotates with the Earth. Recently, the method for Extreme Ultraviolet (EUV) image reconstruction of the plasmasphere was improved by Huang Y et al (2021). The low-density region outside the plasmasphere is called the trough.…”