HR: 0800h
AN: SM31B-0418    [Abstracts]
TI: Magnetic Reconnection in Global MHD Modeling of Magnetosphere Dynamics
AU: * Kuznetsova, M M
EM: masha@elbrus.gsfc.nasa.gov
AF: NASA Goddard Space Flight Center, Code 612.3, Greenbelt, MD 20771 United States
AU: Hesse, M
SM31B-0418 AF: NASA Goddard Space Flight Center, Code 612.3, Greenbelt, MD 20771 United States
AU: Rastatter, L
SM31B-0418 AF: NASA Goddard Space Flight Center, Code 612.3, Greenbelt, MD 20771 United States
AU: Toth, G
SM31B-0418 AF: University of Michigan, 2455 Hayward St., Ann Arbor, MI 48109 United States
AU: De Zeeuw, D
SM31B-0418 AF: University of Michigan, 2455 Hayward St., Ann Arbor, MI 48109 United States
AU: Gombosi, T
SM31B-0418 AF: University of Michigan, 2455 Hayward St., Ann Arbor, MI 48109 United States
AB: 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.
DE: 2700 MAGNETOSPHERIC PHYSICS (6939)
DE: 2723 Magnetic reconnection (7526, 7835)
DE: 2784 Solar wind/magnetosphere interactions
DE: 7827 Kinetic and MHD theory
DE: 7835 Magnetic reconnection (2723, 7526)
SC: SPA-Magnetospheric Physics [SM]
MN: Fall Meeting 2005