Japan Geoscience Union Meeting 2023

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[E] Online Poster

P (Space and Planetary Sciences ) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM10] Dynamics of Magnetosphere and Ionosphere

Thu. May 25, 2023 10:45 AM - 12:15 PM Online Poster Zoom Room (2) (Online Poster)

convener:Akiko Fujimoto(Kyushu Institute of Technology), Akimasa Ieda(Institute for Space-Earth Environmental Research, Nagoya University), Yuka Sato(Nippon Institute of Technology), Shun Imajo(Data Analysis Center for Geomagnetism and Space Magnetism, Graduate School of Science, Kyoto University)

On-site poster schedule(2023/5/24 17:15-18:45)

10:45 AM - 12:15 PM

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

*Satoshi Taguchi1, Hiroyuki Goto1, Haruto Koike1, Keisuke Hosokawa2 (1.Department of Geophysics, Graduate School of Science, Kyoto University, 2.Department of Communication Engineering and Informatics, University of Electro-Communications)

Keywords:cusp, aurora, Alfvén waves

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.