講演情報
[PEM12-P15]Initial results of SDI-3D thermospheric measurements in 2024-2025 winter
*大山 伸一郎1,2、Conde Mark3、Vanhamaki Heikki4、Habtamu Tesfaw4、Cai Lei4、Aikio Anita4、Virtanen Ilkka4、細川 敬祐5、小川 泰信2、Raita Tero6、Branning Kylee3、石井 守1,7、Ridley Aaron8 (1.名古屋大学宇宙地球環境研究所、2.国立極地研究所、3.アラスカ大学フェアバンクス校地球物理学研究所、4.オウル大学、5.電気通信大学、6.オウル大学ソダンキュラ観測所、7.情報通信研究機構、8.ミシガン大学)
キーワード：
高緯度、熱圏、電離圏、Scanning Doppler Imager、EISCAT
Aurorae and ionospheric plasma flows exhibit intricate, fine structures that vary temporally and spatially superimposing on the global-scale structure. These fine structures represent the true form of the magnetosphere-ionosphere coupled system and relate to crucial fact in advancing our understanding of energy dissipation processes in the partially ionized plasma or ionosphere at high latitudes. One of the primary research activities of the EISCAT_3D and optical camera network developed in Northern Scandinavia is to conduct observational studies of these fine structures.
A comprehensive understanding of energy dissipation processes in the polar upper atmosphere is contingent upon two primary aspects. The first involves advancing research on particle collision processes through the examination of individual and simultaneous measurements of ionospheric plasma and thermospheric neutrals. This approach will enhance our comprehension of how fine structures of aurora and ionospheric plasma flow impact the thermosphere. The second aspect focuses on conducting wide-area two-dimensional observations of the thermosphere to thoroughly examine both its large-scale structure, characterized by tidal motions and ion drag resulting from ionospheric plasma convection, as well as the delay and displacement of temporal and spatial variations associated with inertia and advection of the thermosphere. Previously, there is no observational system to comprehensively address these two aspects. In 2018, an international project (SDI-3D) was established with researchers from Japan, the United States, and Finland. They developed a comprehensive observation system utilizing three large optical interferometers (SDI-3D) and a next-generation ionospheric radar (EISCAT_3D) to monitor the thermosphere and ionosphere in Northern Scandinavia. Along with an optical camera network already exists in the area, this system provides the world's first capability of simultaneously measuring fine structures of the thermosphere, ionosphere, and aurora in the wide area.
The poster presentation will report findings from the 2024-2025 winter season, address methodological challenges encountered from initial analysis, and discuss observational strategies for the subsequent season.
A comprehensive understanding of energy dissipation processes in the polar upper atmosphere is contingent upon two primary aspects. The first involves advancing research on particle collision processes through the examination of individual and simultaneous measurements of ionospheric plasma and thermospheric neutrals. This approach will enhance our comprehension of how fine structures of aurora and ionospheric plasma flow impact the thermosphere. The second aspect focuses on conducting wide-area two-dimensional observations of the thermosphere to thoroughly examine both its large-scale structure, characterized by tidal motions and ion drag resulting from ionospheric plasma convection, as well as the delay and displacement of temporal and spatial variations associated with inertia and advection of the thermosphere. Previously, there is no observational system to comprehensively address these two aspects. In 2018, an international project (SDI-3D) was established with researchers from Japan, the United States, and Finland. They developed a comprehensive observation system utilizing three large optical interferometers (SDI-3D) and a next-generation ionospheric radar (EISCAT_3D) to monitor the thermosphere and ionosphere in Northern Scandinavia. Along with an optical camera network already exists in the area, this system provides the world's first capability of simultaneously measuring fine structures of the thermosphere, ionosphere, and aurora in the wide area.
The poster presentation will report findings from the 2024-2025 winter season, address methodological challenges encountered from initial analysis, and discuss observational strategies for the subsequent season.