日本地球惑星科学連合2019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-EM18] 太陽圏・惑星間空間

2019年5月29日(水) 15:30 〜 17:00 ポスター会場 (幕張メッセ国際展示場 8ホール)

コンビーナ:坪内 健(電気通信大学)、西野 真木(宇宙航空研究開発機構宇宙科学研究所)、成行 泰裕(富山大学人間発達科学部)、岩井 一正(名古屋大学 宇宙地球環境研究所)

[PEM18-P05] Structural variations in the pickup ion density associated with magnetic reconnection at the heliopause

*坪内 健1 (1.電気通信大学)

Pickup ions (PUIs) can be the probe for the physical processes occurring around the heliopause in the form of energetic neutral atoms (ENAs) after their charge-exchange with interstellar neutral particles. In this study, we focus on the nonstationarity of the heliopause, where the directional change in the magnetic field is approaching. This situation triggers the magnetic reconnection at the heliopause, resulting in the mixing of particles between the heliosphere and interstellar space. We have performed two-dimensional hybrid simulations to follow the PUI kinetics. It is confirmed that PUI in the outer heliosheath are gathered into the reconnection site accompanied with the coalescence of magnetic islands. We calculate the column density integrated across the heliopause, which will be associated with the ENA observations by IBEX. The properties of its spatial and temporal variations are compared with those from the case of Kelvin-Helmholtz instabilities along the heliopause. It will be useful for the identification of the heliopause environment by extracting these properties from the observational data.