Mathematics – Dynamical Systems
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm31b1241s&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM31B-1241
Mathematics
Dynamical Systems
2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2760 Plasma Convection, 2778 Ring Current, 2788 Storms And Substorms
Scientific paper
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.
Horton Wendell
Mithaiwala Manish
Spencer E. A.
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