[P-EM17] 宇宙プラズマ科学

[PEM17-09] スーパーコンピューター富岳を用いたCMEイベント時の超高解像度磁気圏シミュレーション

*松本 洋介¹、百瀬 遼太²、三好 由純³ (1.千葉大学国際高等研究基幹、2.千葉大学融合理工学府、3.名古屋大学宇宙地球環境研究所)

キーワード：磁気圏グローバルMHDシミュレーション、CMEイベント、富岳スーパーコンピューター

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.