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

[PEM12-P16] Variation of high-latitude plasma depression region during a moderate magnetic storm using the polar variable GAIA

*Chihiro Tao¹, Hidekatsu Jin¹, Atsuki Shinbori², Hiroyuki Shinagawa³, Yasunobu Miyoshi³, Hitoshi Fujiwara⁴, Takuya Sori⁵ (1.National Institute of Information and Communications Technology, 2.Nagoya University, 3.Kyushu University, 4.Seikei University, 5.Kyoto University)

Keywords:GAIA, simulation, ionosphere, thermosphere

We are developing the model GAIA (Ground-to-Topside Model of Atmosphere and Ionosphere for Aeronomy) to include the magnetospheric variation via electric field deposition and auroral electron precipitation at the polar region and penetration of the electric field toward mid-to-low latitude. Model results of a moderate geomagnetic storm event on September 27-28, 2017 showed good reproducibility of the plasma density variation at the mid-to-low latitude due to penetrating electric field and that at equatorial region compared with observations. In addition, the electron density depletion structure was reproduced in the morning polar region at the maximum development of the geomagnetic storm. We will discuss the generation mechanism and development of the depletion structure in this presentation.