Japan Geoscience Union Meeting 2025

Presentation information

Print

[E] Oral

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

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

Mon. May 26, 2025 3:30 PM - 5:00 PM 303 (International Conference Hall, 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), Chairperson:Takanori Nishiyama(National Institute of Polar Research), Yang-Yi Sun(China University of Geosciences)


3:45 PM - 4:00 PM

[PEM12-38] The Variability of the Equatorial Ionospheric Vertical and Field-aligned Plasma Drifts During the SSW

*Ruilong Zhang1 (1.Institute of Geology and Geophysics, Chinese Academy of Sciences)

Keywords:vertical plasma drift, field-align plasma drift, neutral wind, SSW

We use the measurements of the Ionospheric Connections Explorer (ICON) and Communication/Navigation Outage Forecasting System (C/NOFS) satellites to present the responses of the equatorial ionospheric vertical and field-aligned plasma drift during the 2009 and 2021 sudden stratosphere warmings (SSW). The observations show that both the vertical and field-aligned drifts present the semidiurnal disturbances during the SSW. The ICON records the afternoon northward disturbance in field-aligned plasma drift mainly due to the disturbance meridional wind. Based on the whole atmosphere model Ground-to-topside model of Atmosphere and Ionosphere for Aeronomy, the meridional wind can contribute to the disturbance field-aligned drift. Further, the semidiurnal disturbances in vertical and field-aligned drift can well explain the responses of the total electron content to the SSW and their hemispheric differences. Further, the disturbances in vertical and field-aligned plasma drifts can cause the ionosphere-plasmasphere coupling in equatorial and low latitudes. Our results give a new perspective for understanding the ionospheric perturbations during SSW.