日本地球惑星科学連合2022年大会

講演情報

[J] ポスター発表

セッション記号 P (宇宙惑星科学) » P-EM 太陽地球系科学・宇宙電磁気学・宇宙環境

[P-EM16] 宇宙プラズマ理論・シミュレーション

2022年5月30日(月) 11:00 〜 13:00 オンラインポスターZoom会場 (5) (Ch.05)

コンビーナ:天野 孝伸(東京大学 地球惑星科学専攻)、コンビーナ:三宅 洋平(神戸大学計算科学教育センター)、梅田 隆行(名古屋大学 宇宙地球環境研究所)、コンビーナ:中村 匡(福井県立大学)、座長:天野 孝伸(東京大学 地球惑星科学専攻)

11:00 〜 13:00

[PEM16-P06] Autonomously Vibrating Magnetosphere generated by Forward and Inverse Karman Vortex and Lobe Reconnection in a Northward Magnetic Field

*CAI DongSheng1 (1.筑波大学)

キーワード:順逆カルマン渦、自律的磁気圏、ローブ磁気結合

Several papers discussed Kelvin-Helmholtz (K-H) instability and its related waves and vortexes using global 2D/3D MHD simulations [Guo et al., 2010; Li et al., 2012; Li et al., 2013; Merkin et al., 2013]. They find a double-vortex sheet in which a vortex train propagates along the inner and outer edges of the magnetopause both in dawn and dusk, which is so-called a forward Karman vortex street. In the forward Karman vortex street, the paired and staggered two vortexes face each other in counterclockwise and generate a dragging flow. Those vortex trains in the inner and outer edges continues to north and south into ionospheres to form the ionospheric Karman vortex street. However, those two inner vortex trains, respectively, from the dawn and dusk sides of the magnetosphere near the equator plain face each other in clockwise and generate a propulsion flow crossing the pole. This vortex street system is so-called an inverse Karman vortex street. The propulsion flow is generated by the lobe reconnection. Global magnetospheric coherent structures related to the dynamical coupling between the dayside magnetopause frontier and ionosphere in a northward IMF configuration are analyzed using the concept of forward and inverse Karman vortex street in a global 3D MHD simulation.