[P-EM17] Space Plasma Science

[PEM17-09] Super-high-resolution Global MHD simulations of the terrestrial magnetosphere during a coronal mass ejection event using the Fugaku supercomputer

*Yosuke Matsumoto¹, Ryota Momose², Yoshizumi Miyoshi³ (1.Institute for Advanced Academic Research, Chiba University, 2.Graduate School of Science and Enginerring, Chiba University, 3.Institute for Space–Earth Environmental Research)

Keywords:global MHD simulations of the magnetosphere, CME event, Fugaku supercomputer

We have developed a global magnetohydrodynamic (MHD) simulation model of the magnetosphere using the public MHD code CANS+ (Matsumoto et al., 2019; Matsumoto and Miyoshi, 2022). In this talk, we report recent improvements to the model: The tilt of the magnetic dipole moment with respect to the rotation axis was incorporated into the model to discuss more realistic structures in the cusp and the night-side plasma sheet with a north-south asymmetry. We also introduced approximated characteristic variables in the numerical interpolation scheme (Miyoshi and Minoshima, JCP, 2020). This modification of the interpolation algorithm enables more efficient computation than that with the full characteristics.

Using the updated model, we successfully solve an interaction with a coronal mass ejection event in the solar wind based on the properties of CME events (Kataoka and Miyoshi, 2006) with a super-high resolution on the Fugaku supercomputer. We will present the detailed structures of the magnetosphere under such a disturbed solar wind and the computational efficiency on the Fugaku supercomputer with the new numerical scheme.