Magnetic Reconnection in Global MHD Modeling of Magnetosphere Dynamics

Details Magnetic Reconnection in Global MHD Modeling of Magnetosphere Dynamics Magnetic Reconnection in Global MHD Modeling of Magnetosphere Dynamics

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm31b0418k&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM31B-0418

Physics

2700 Magnetospheric Physics (6939), 2723 Magnetic Reconnection (7526, 7835), 2784 Solar Wind/Magnetosphere Interactions, 7827 Kinetic And Mhd Theory, 7835 Magnetic Reconnection (2723, 7526)

Scientific paper

One of the major challenges in global MHD modeling of magnetosphere dynamics is to find an accurate description of the reconnection rate. We will take advantage of recent progress in small-scale kinetic studies of magnetic reconnection, which demonstrated that the reconnection rate is controlled by ion nongyrotropic behavior near the reconnection site. It can then be expressed in terms of nongyrotropic corrections to the electric field. We will demonstrate that the reconnection electric field can be estimated as a convection electric field v x B at the edge of the non-MHD diffusion region. The BATSRUS adaptive grid structure allows to perform global simulations with spatial resolution near the reconnection site comparable with ion kinetic scales. To reproduce fast reconnection rates observed in kinetic simulations we modified the global MHD code BATSRUS by introducing nongyrotropic corrections to the magnetic induction equation. The role of the nongyrotropic effects near the reconnection site on the global magnetospheric dynamics will be analyzed. Testing the ability of global MHD models to describe magnetospheric dynamics is one of the elements of science based validation efforts at the Community Coordinated Modeling Center.

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