[P-EM10] Dynamics of Magnetosphere and Ionosphere

[PEM10-P16] Alfvénic processes of main cusp aurora and poleward-moving cusp aurora

*田口 聡¹、後藤 啓之¹、小池 春人¹、細川 敬祐² (1.京都大学大学院理学研究科地球惑星科学専攻地球物理学教室、2.電気通信大学大学院情報理工学研究科)

キーワード：カスプ、オーロラ、アルベーン波

It is not yet well understood whether the ionospheric Alfvén resonator is equally or differently involved in electron acceleration in the main cusp aurora and the poleward-moving cusp aurora. In this study, we examined data from the conjugate observation of cusp auroras obtained at a wavelength of 630 nm by a ground-based all-sky imager and the electric and magnetic fields obtained at the cusp at an altitude of about 500 km by the SWARM satellite. The analysis revealed that features consistent with trapping in the ionospheric Alfvén resonator were found in both the main cusp aurora and the poleward-moving cusp aurora. We report how those features differ depending on the regions including the area in between, and discuss the reason for the differences.