Seminar: Simulating Storm-Time Magnetospheric Dynamics with the MAGE Model

Wednesday, October 07, 2020 - 3:00pm to 4:00pm

Speaker: Shanshan Bao, Postdoctoral Research Associate at Rice University 


Abstract: Modeling storm-time magnetospheric dynamics requires treating both the outer and inner magnetosphere within the same simulation domain, while resolving processes ranging from global to micro-scales, with mesoscales often playing the role of a conduit for energy transfer and particle transport. Global magnetohydrodynamic (MHD) models describe the solar wind-magnetosphere interaction self-consistently evolving the plasma moments, the magnetic field and the convective electric field. This approach is usually appropriate for the outer magnetosphere, but in the near-Earth region, where the plasmas exhibit energy-dependent drifts, dedicated ring current models become more appropriate for the description of the particle drift dynamics and the plasma pressure distribution. In this talk, I will describe a recently developed Multiscale Atmosphere-Geospace Environment (MAGE) model that combines a new generation global MHD model, GAMERA, with the widely-used ring current model, the Rice Convection Model (RCM), along with the upper atmosphere-ionosphere global circulation model, TIEGCM. I will present the newly developed features including the ionospheric electron precipitation and a dynamic plasmasphere model. The new developments are crucial for the self-consistent description of the feedback loops in the storm-time geospace system, including modulation of storm-time ionospheric conductance and the ring current. The self-consistent coupling will be demonstrated by way of example of the joint development of the plasmaspheric plume and the plume of ionospheric storm-enhanced density in a global storm-time simulation.

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