[P-EM18] 太陽地球系結合過程の研究基盤形成

[PEM18-P08] Space weather modelling of the dayside polar ionosphere and thermosphere

*藤原 均¹、三好 勉信²、野澤 悟徳³、小川 泰信⁴、陣 英克⁵、垰 千尋⁵、品川 裕之⁵ (1.成蹊大学理工学部、2.九州大学 大学院理学研究院 地球惑星科学部門、3.名古屋大学宇宙地球環境研究所、4.国立極地研究所、5.情報通信研究機構)

キーワード：極域電離圏・熱圏、宇宙天気、モデリング

From the European Incoherent Scatter (EISCAT) radar observations, we have shown some features of the ionospheric disturbances in the dayside polar cap region where ionospheric and thermospheric observations are not enough to understand the space weather effects. For example, some ionospheric disturbances have been observed in the northward of Longyearbyen (> 80^o latitude) even during geomagnetically quiet periods, while disturbances are generated in the auroral region (at Tromsø) during the geomagnetically disturbed periods. CME-induced disturbances and ionization due to high energy particle precipitation have been also observed in the dayside polar ionosphere.
In order to understand and predict the phenomena in the dayside polar ionosphere and thermosphere, we have also made modelling/simulation studies. In particular, we focus on modelling the effects of precipitating particles on the dayside polar ionosphere and thermosphere in the context of the Japanese Space Weather projects. In the present study, we will show some observational and simulation results: for example, the dayside ionospheric disturbances observed with the EISCAT radar system and simulations with a GCM. In addition, we will introduce our attempt to estimate productions of ions, NOx, and HOx in the altitude of 50-500 km due to precipitating particles.