Article Dans Une Revue Journal of Geophysical Research Space Physics Année : 2024

Modeling Soft X‐Ray Emissions at the Dayside Magnetopause

Résumé

In this study, we simulate the Solar Wind Charge Exchange (SWCX) soft X-ray emissions at dayside magnetosheath and cusps by using magnetohydrodynamic (MHD) and LAtmos TEst Particle (LaTeP) models. MHD models are unable to resolve the particle kinetic effects, such as the different behaviors of ions with different q/m, or distinguish the magnetospheric plasma from the solar wind plasma. We investigate these effects with the LaTeP model. As the LaTeP model does not self-compute magnetic and electric field, the magnetic and electric field data obtained from Open Geospace General Circulation Model (OpenGGCM) and Lagrangian version of the piecewise parabolic method (PPMLR) MHD model are used as the input to LaTeP model. The soft X-ray emissivity maps simulated from pure OpenGGCM and PPMLR MHD approaches and from LaTeP-OpenGGCM and LaTeP-PPMLR approaches are presented and compared. The results indicate that the LaTeP model can well resolve the kinetic effects and can be used to investigate the individual spectral characteristics. Therefore, the LaTeP model is a complementary approach for simulating the X-ray emissions near the dayside magnetopause. We also calculate the ratio of integrated OVII/OVIII line intensities, produced by charge exchange of O 7+ ions and O 8+ ions, respectively. We find a relatively higher ratio at the bow shock compared to the surrounding areas, suggesting that this ratio can be an effective parameter to identify the bow shock location.

Plain Language Summary At the magnetopause, X-ray emissions are generated by charge exchange reactions between multiply charged heavy solar wind ions and the neutral hydrogen atoms in the geocorona. In this study, we simulate the soft X-ray emissions around the Earth by using magnetohydrodynamic (MHD) and LAtmos TEst Particle (LaTeP) model. As the LaTeP model requires external magnetic and electric field input, we use the magnetic and electric field data obtained from OpenGGCM and PPMLR MHD model as its input. Then the simulation results from pure OpenGGCM and PPMLR MHD approaches and from LaTeP-OpenGGCM and LaTeP-PPMLR approaches are presented and compared. The comparison indicates that the LaTeP model can well resolve particle kinetic effects and individual spectral features. Therefore, the LaTeP model is a complementary approach for simulating the X-ray emissions in Earth's magnetopause. The maps of the ratio of spectral lines produced by O 7+ ions and O 8+ ions are also calculated. At the bow shock, this ratio is higher than that of the surrounding areas, indicating it is an effective parameter to identify the bow shock.

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Dates et versions

insu-04678681 , version 1 (27-08-2024)

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Qiuyu Xu, Dimitra Koutroumpa, Ronan Modolo, Tianran Sun, Hyunju Connor, et al.. Modeling Soft X‐Ray Emissions at the Dayside Magnetopause. Journal of Geophysical Research Space Physics, 2024, 129 (8), pp.e2024JA032687. ⟨10.1029/2024ja032687⟩. ⟨insu-04678681⟩
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