JpGU-AGU Joint Meeting 2017

講演情報

[EE] 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-EM12] [EE] Space Weather, Space Climate, VarSITI

2017年5月23日(火) 15:30 〜 17:00 ポスター会場 (国際展示場 7ホール)

コンビーナ:片岡 龍峰(国立極地研究所)、Antti A Pulkkinen(NASA Goddard Space Flight Center)、草野 完也(名古屋大学宇宙地球環境研究所)、塩川 和夫(名古屋大学宇宙地球環境研究所)

[PEM12-P32] Reconstructing polar asymmetry of GLE69 via WASAVIES simulation

*PARK INCHUN1三好 由純1佐藤 達彦2片岡 龍峰3久保 勇樹4三宅 晶子5 (1.名古屋大学宇宙地球環境科学研究所、2.日本原子力研究開発機構、3.国立極地研究所、4.情報通信研究機構、5.茨城工業高等専門学校)

キーワード:WASAVIES, Solar Energetic Particle, Space Weather

Solar Energetic Particle(SEP) is one of the most important components for predicting space weather. When a powerful SEP event occurs, neutron observations on the ground can detect the increase of flux. This event is called Ground Level Enhancement(GLE).
On January 20, 2005, a powerful GLE (GLE69) occurred, causing significant flux enhancement on south pole region. The McMurdo neutron monitor in Antarctica recorded 18 times more fluxes compared to Thule station in Greenland. Previous studies suggested that this asymmetry phenomenon is related to IMF direction, which has never been confirmed by the simulation.
In this research, we investigate this asymmetry of neutron flux using WASAVIES (Warning System for Aviation Exposure to SEP [Kataoka et al., 2014]) which consists of SEP simulation in the heliosphere, particle trajectory tracing in the magnetosphere, and the air shower simulation. Using WASAVIES, we investigate propagation direction of SEPs and compare the results with neutron monitor observations. Initial results of this study indicate that SEPs come mainly from southern-hemisphere, which is consistent with previous studies. The results also suggest importance of transportation of SEP in the azimuthal direction, which has not included in this study.