日本地球惑星科学連合2023年大会

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セッション記号 P (宇宙惑星科学) » P-EM 太陽地球系科学・宇宙電磁気学・宇宙環境

[P-EM12] Coupling Processes in the Atmosphere-Ionosphere System

2023年5月21日(日) 10:45 〜 12:00 101 (幕張メッセ国際会議場)

コンビーナ:Liu Huixin(九州大学理学研究院地球惑星科学専攻 九州大学宙空環境研究センター)、大塚 雄一(名古屋大学宇宙地球環境研究所)、Chang Loren(Institute of Space Science, National Central University)、Yue Deng(University of Texas at Arlington)、座長:Lin Charles(Department of Earth Sciences, National Cheng Kung University)、斎藤 享(国立研究開発法人海上・港湾・航空技術研究所電子航法研究所)


11:30 〜 11:45

[PEM12-09] Signatures of a Strong Wintertime Polar Vortex on Thermospheric O/N2 and Plasma Density

*Katelynn Greer1、Larisa Goncharenko2、Lynn Harvey1、Nick Pedatella3 (1.LASP、2.MIT-Haystack、3.NCAR-HAO)

キーワード：Thermosphere, Ionosphere, Polar Vortex

The polar vortex is a major feature of the winter hemisphere, and its strength affects the dynamical structure (temperature and winds) and composition throughout the entire atmospheric column, from the troposphere to the thermosphere. In this work we investigate the strength of the polar vortex using the NAM index and its impact on both thermospheric composition (using the TIMED/GUVI instrument) as well as ionospheric plasma density (using TEC). While signatures of weak polar vortex events (associated with Sudden Stratospheric Warmings) in the thermosphere and ionosphere have been thoroughly investigated, less is known about the opposite conditions, a very strong polar vortex. Here we show that strong vortex events may have reversed O/N2 structures as compared to weak vortex conditions implying that there are critical dynamics associated with the state of the polar vortex that drive thermosphere composition.