[P-EM13] 太陽地球系結合過程の研究基盤形成

[PEM13-11] Variations of the polar ionosphere, thermosphere, and mesosphere caused by energy inputs from the magnetosphere

*藤原 均¹、野澤 悟徳²、小川 泰信³、三好 勉信⁴、品川 裕之⁵、陣 英克⁵、片岡 龍峰³、Liu Huixin⁴ (1.成蹊大学理工学部、2.名古屋大学宇宙地球環境研究所、3.国立極地研究所、4.九州大学理学研究院、5.情報通信研究機構)

キーワード：電離圏、熱圏、中間圏、EISCAT、シミュレーション、極域

The Earth's atmospheric system has been maintained under the energy inputs from the Sun. In particular, the polar upper atmosphere has been affected significantly by the solar radiation and solar wind energy inputs. In order to understand the energy dissipation processes in the polar upper atmosphere, we should understand behaviours of both the plasmas and neutrals. The European Incoherent Scatter (EISCAT) radar system, which covers from the auroral oval to polar cap region, has been one of unique and powerful tools to monitor the solar wind energy input and its resultant plasma and neutral phenomena. Recently, the upgrade of the EISCAT radar system (EISCAT_3D) is planed to capture the 3D structures of the polar ionosphere, thermosphere, and mesosphere. The new EISCAT system will enable us to understand fine and 3D structures of plasma and neutral motions. In addition to the observations, we have performed numerical simulations using a global model which covers all the atmospheric regions and ionosphere. A model of the chemical processes in the mesosphere and thermosphere are under development for the global model.
In the present study, we will show some observational and simulation results obtained from the EISCAT observations and the global simulations. Then, we will discuss the outstanding issues which should be challenged after the progresses of observational and modelling techniques.