Examining metal ion transport’s contribution to the sporadic E layer occurrence in the summertime southern hemisphere

安藤 慧; 齊藤 昭則; 品川 裕之

講演情報

[E] 口頭発表

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26日(月) 09:00 〜 10:30 303 (幕張メッセ国際会議場)

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)、座長:Chang Loren(Institute of Space Science, National Central University)、Lin Charles(Department of Earth Sciences, National Cheng Kung University)

09:00 〜 09:15

[PEM12-19] Examining metal ion transport’s contribution to the sporadic E layer occurrence in the summertime southern hemisphere

*安藤慧¹、齊藤昭則²、品川裕之³ (1.国立研究開発法人情報通信研究機構、2.京都大学大学院理学研究科地球物理学教室、3.九州大学国際宇宙惑星環境研究センター)

キーワード：スポラディックE層、シミュレーション、金属イオン、電離圏

The simulation of the sporadic E (Es) occurrence distribution at middle and low latitudes in the summer southern hemisphere is presented. The Es distribution in the summer southern hemisphere, which shows a salient decrease around Southern Africa, has been considered owing to the geomagnetic field configuration. In this study, we conducted Es simulations for the summer southern middle and low latitudes. The simulated Es distribution showed a qualitative agreement with radio occultation observations by COSMIC-1. The simulated Es distributions did not differ significantly with or without the longitudinal variations in the geomagnetic fields. Zonal ion transport driven by diurnal and semi-diurnal tides swept out metal ions from around Southern Africa, significantly reducing the EsL occurrence there. We found that the metal ion transport can be more important for the Es distribution than the geomagnetic field configuration in the summertime southern hemisphere.