Anomalous daytime downward plasma drift at the dip equator observed by ICON satellite

Liu Huixin; Narimoto Hiroshi

講演情報

[E] ポスター発表

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

2025年5月25日(日) 17:15 〜 19:15 ポスター会場 (幕張メッセ国際展示場 7・8ホール)

コンビーナ:細川敬祐(電気通信大学大学院情報理工学研究科)、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)

17:15 〜 19:15

[PEM12-P21] Anomalous daytime downward plasma drift at the dip equator observed by ICON satellite

*Liu Huixin¹、Narimoto Hiroshi¹ (1.九州大学理学研究院地球惑星科学専攻 )

キーワード：Vertical plasma drift at dip equator、equatorial ionization anomaly、ICON satellite

The equatorial ioniozation anomaly is the most dominant structure of equatorial ionosphere. It is driven by the well-known fountain process that drives the plasma upward at the dip equator during daytime. Thus, upward plasma drift is normal during day. However, downward plasma drift has been frequenly observed by the ICON satellite during Nov. 2019 ~ Nov. 2022. We examine the occurence rate of the abnormal downward drift and geophysical conditions that induce it, along with impact on the equatorial ionosphere structure.