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

[PEM12-09] Impact of Neutral Wind Dynamo on the Magnetospheric Configuration: MHD-GCM Coupled Simulations for May 2024 Storm

*Yue Deng¹ (1.University of Texas at Arlington)

キーワード：neutral wind dynamo, ionosphere and thermosphere, magnetosphere, May 2024 storm

Through the neutral wind dynamo, thermosphere generates ionospheric currents that can affect high-latitude electrodynamics, especially during intense geomagnetic storms. However, this significant effect has not been well-studied and typically has not been included in the magnetosphere-ionosphere (MI) simulations. In this study, the influences of the ionospheric current due to neutral-wind dynamo on the electrodynamics of the ionosphere-magnetosphere system have been evaluated for the May 2024 storm, using the coupled Global Ionosphere-Thermosphere Model (GITM) and the Geospace components of Space Weather Modeling Framework (SWMF). Specifically, the neutral wind-driven field-aligned currents (FACs) are combined with the magnetospheric-origin FACs to specify the high-latitude electric potential, which is imposed back into the magnetosphere. We focus on the following three aspects: 1) to compare the distribution and magnitude of neutral wind-driven FACs from GITM and the magnetospheric-origin FACs from SWMF at high latitudes; 2) to assess how the neutral wind-driven FACs affect the magnetospheric configuration and the high-latitude potential; 3) furthermore, to evaluate the relative significance between wind-driven current and magnetospheric-origin current to the geomagnetic disturbance (GMD) at middle- and low-latitudes. Our study will help to accurately simulate the physical processes in the M-I system and provide new insights for the physical processes in the magnetosphere-ionosphere-thermosphere coupled system.