Storm-time Inner Magnetosphere: Self-consistent Kinetic Simulation Driven by the Space Weather Modeling Framework

Details Storm-time Inner Magnetosphere: Self-consistent Kinetic Simulation Driven by the Space Weather Modeling Framework Storm-time Inner Magnetosphere: Self-consistent Kinetic Simulation Driven by the Space Weather Modeling Framework

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm14a..03z&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM14A-03

Physics

2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2753 Numerical Modeling, 2760 Plasma Convection (2463), 2788 Magnetic Storms And Substorms (7954)

Scientific paper

Accurately modeling inner magnetosphere dynamics requires proper treatment of both the kinetic drift physics as well as the interaction between particles and fields. Observations consistently show the inner magnetosphere magnetic field to be significantly depressed during geomagnetic storms. The field changes are caused by large amounts of injected ring current plasma, which in turn strongly influence the dynamic evolution of the plasma. We have developed a self-consistent inner magnetosphere code that treats this self- consistent interaction, through coupling a kinetic ring current model (RAM) with an Euler potential-based 3D plasma equilibrium code; in our approach, the magnetic field is computed in force balance with the kinetic model anisotropic pressures (anisotropy being critically important for the excitation of EMIC waves), and then fed back into the kinetic code. Here we report results from simulating a geomagnetic storm using this model, with plasma and magnetic field on the boundary supplied from the global BATSRUS MHD code from the Space Weather Modeling Framework (SWMF); we focus in particular on the following aspects: 1). the effect of the MHD model boundary vs. observation-based (from LANL satellites) boundary conditions; 2). the effect of magnetic self-consistency on ring current plasma pressure, anisotropy and EMIC wave instability; and 3). the relative magnitude of the induced vs. convective electric fields in the inner magnetosphere during the storm.

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