[P-CG31] 宇宙科学・探査の将来計画と関連する機器・技術の現状と展望

[PCG31-02] オーロラ探査編隊飛行観測衛星計画

*浅村 和史¹、三好 由純²、坂野井 健³、平原 聖文²、松岡 彩子¹ (1.宇宙航空研究開発機構、2.名古屋大、3.東北大)

キーワード：オーロラ, 衛星計画

In 2000s, Fast and Reimei satellite revealed fine-scale plasma particle and wave structures which are considered to be playing a siginificant role in magnetoshere - ionosphere coupling. They carry plasma instuments with time resolution of tens of ms which is much higher than previous. In particular, Reimei conducted plasma particle measurements togather with auroral imagings in which ionospheric footprints were captured. It provides us a hint for fine-scale spatial plasma structures in the auroral region although it is a single-satellite platform. However, it is still difficult to investigate a dynamics of plasma processes by using the simultaneous observations without wave measurements, like Reimei. It would be necessary to make a simultaneous observation of plasma particles and auroral emissions togather with waves, which is never made so far. We are planning a multi-satellite formation flight mission for auroral observation. Main purpose of the mission is to reveal (1) time- and spatial-structures of auroral particle accelaration caused by Alfven waves and field-aligned electric field, (2) energy transfer between plasma waves and ions in supra-thermal energy range, and (3) fine-scale plasma structures which trigger global-scale changes and vice versa. We will discuss possible mission configurations.