Japan Geoscience Union Meeting 2025

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[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

Sun. May 25, 2025 10:45 AM - 12:15 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:Takeshi Sakanoi(Planetary Plasma and Atmospheric Research Center, Graduate School of Science, Tohoku University), Elvira Astafyeva(Institut de physique du Globe de Paris)

11:15 AM - 11:30 AM

[PEM12-03] Modeling the post-midnight equatorial plasma bubbles with SAMI3/SD-WACCM-X

*Min-Yang Chou1,2, Jia Yue2,1, Fabrizio Sassi1, Sarah McDonald3, Jennifer Tate4, Nick Pedatella6,5, Lynn Harvey7,8 (1. NASA Goddard Space Flight Center, Greenbelt, MD, USA, 2.Department of Physics, Catholic University of America, Washington, DC, USA, 3.Naval Research Laboratory, Space Science Division, Washington, DC, USA, 4.Computational Physics, Inc., Springfield, VA, USA, 5.High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, USA, 6.COSMIC Program Office, University Corporation for Atmospheric Research, Boulder, CO, USA, 7.Laboratory for Atmospheric Space Physics, University of Colorado, Boulder, CO, USA, 8.Department of Atmosphere and Oceanic Sciences, University of Colorado, Boulder, CO, USA)

Keywords:EPBs, gravity waves, LSWS

This study investigates the post-midnight equatorial plasma bubbles (EPBs) using the coupled Sami3 is A Model of the Ionosphere (SAMI3) and the Specified Dynamics Whole Atmosphere Community Climate Model with thermosphere-ionosphere eXtension (SD-WACCM-X) models. Simulations for October 20, 22, and 24 in 2020 are presented to explore the day-to-day and longitudinal variability of EPBs. SAMI3/SD-WACCM-X self-consistently generated midnight EPBs on October 20 and 24, displaying irregular and regular spatial distributions, respectively. However, EPBs are absent on October 22. Results reveal that gravity waves (GWs) contribute to the formation of large-scale wave structure (LSWS) and subsequent EPB development, and the horizontal scales of GWs determine the interspacing of EPBs. Neutral wind variations associated with GWs and large-scale solar terminator waves significantly impact the ionospheric electrodynamics and background conditions, shaping the day-to-day variability of EPBs. These findings emphasize the significant influence of GWs and background wind fields on the formation of LSWS and irregularities. The influence of GWs and gravity-driven dynamo effects on LSWS development are also discussed.