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

Huixin Liu; Narimoto Hiroshi

Presentation information

[E] Poster

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

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

Sun. May 25, 2025 5:15 PM - 7:15 PM Poster Hall (Exhibition Hall 7&8, Makuhari Messe)

convener:Keisuke Hosokawa(Department of Communication Engineering and Informatics, University of Electro-Communications), Huixin Liu(Earth and Planetary Science Division, Kyushu University SERC, Kyushu University), Yuichi Otsuka(Institute for Space-Earth Environmental Research, Nagoya University), Loren Chang(Department of Space Science and Engineering, National Central University)

5:15 PM - 7:15 PM

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

*Huixin Liu¹, Narimoto Hiroshi¹ (1.Department for Earth and Planetary Science, Kyushu University )

Keywords: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.