HR: 0800h
AN: SM31B-1241    [Abstracts]
TI: Analysis of the GEM Storms with the WINDMI Models
AU: * Spencer, E A
EM: espencer@ece.utexas.edu
AF: The University of Texas at Austin, The Institute for Fusion Studies RLM 11.222, Austin, TX 78712 United States
AU: Horton, W
EM: horton@physics.utexas.edu
AF: The University of Texas at Austin, The Institute for Fusion Studies RLM 11.222, Austin, TX 78712 United States
AU: Mithaiwala, M
EM: mithaiwa@physics.utexas.edu
AF: The University of Texas at Austin, The Institute for Fusion Studies RLM 11.222, Austin, TX 78712 United States
AB: An important problem in magnetospheric physics is to develop integrated dynamical systems capable of modeling storm and substorm databases with the long term aim of developing space weather forecasting tools. The 20 parameter WINDMI model is used to analyze the global dynamical behaviour of Geomagnetic storms and substorms. The model is a system of non-linear ordinary differential equations that describe the solar wind-magnetosphere-ionosphere coupling and the interaction of basic energy components in the nightside magnetosphere. An electromotive force derived from Solar Wind parameters is input into the model as a driver. These parameters are measured by the ACE satellite and the data provided by the NSSDC. The output of the model is the westward Auroral Electrojet current and the energy stored in the Earth's ring current which is used to predict AL and Dst. The model has been tested on the seven GEM storms selected for community wide study. These geomagnetic storms cover periods of days and typically contain many substorms. The prediction of the model is compared to the AL and Dst indices provided by the WDC Kyoto. A globally optimum best fit to the data has been performed using the Genetic Algorithm to find the physical parameters of the model. For the GEM storms we find strong correlation between the model output and the data. We compare the performance of this model for the GEM storms with the Temerin-Li Dst model. This work is supported by the National Science Foundation Grant ATM-0229863.
DE: 2730 Magnetosphere--inner
DE: 2740 Magnetospheric configuration and dynamics
DE: 2760 Plasma convection
DE: 2778 Ring current
DE: 2788 Storms and substorms
SC: SPA-Magnetospheric Physics [SM]
MN: 2004 AGU Fall Meeting