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

[PEM12-P34] Global plasma distribution during a moderate magnetic storm using the polar variable GAIA

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

Keywords:GAIA, simulation, ionosphere

We are improving 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. A moderate geomagnetic storm event on September 27-28, 2017 is applied to evaluate model behavior by comparing outputs with observation results from such as the Global Navigation Satellite System and ionosonde observations. Variation in plasma density at the mid-to-low latitude due to penetrating electric field and that at equatorial region show good agreement with observations. Characteristic density enhancement is also seen in the model. On the other hand, TEC estimation in GAIA is usually larger than that from observation. In this presentation, we will discuss the effect of variable auroral flux and the characteristic responses of the ionosphere-thermosphere coupled system found in our model experiments.