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

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

*Min-Yang Chou^1,2、Jia Yue^2,1、Fabrizio Sassi¹、Sarah McDonald³、Jennifer Tate⁴、Nick Pedatella^6,5、Lynn Harvey^7,8 (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)

キーワード：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.