Title: Geospace Modeling

Dr. Michael Wiltberger
NCAR/HAO, Boulder, CO

The Lyon-Fedder-Mobarry (LFM) global scale magnetospheric model has proven remarkably useful in providing a global context for magnetospheric observations.
The LFM simulates the solar wind - magnetosphere - ionosphere interaction by coupling a magnetohydrodynamic (MHD) simulation of the solar wind magnetosphere interaction to a 2D simulation of the ionosphere. This presentation begins with a brief summary of the LFM capabilities and limitations including an overview of the numerical techniques used to solve the MHD equations and the computational resources needed to provide real time simulations. Results from the December 10, 1996 substorm simulation illustrate the accuracy of the model during isolated substorm intervals. Results from the series of magnetospheric storms illustrate the model's ability to simulate long duration events as well as its limited representation of the ring current. Since magnetospheric forecast require predictions of the solar wind conditions extended forecasts require the coupling of the LFM to a solar wind model. In addition, many important space weather factors, e.g. radiation belt fluxes and ionospheric scintillation, are outside the scope of the LFM so it must be coupled to other physics based simulations. This talk concludes by presenting the results coupling the LFM to the Dartmouth energetic particle simulation and the NCAR Thermosphere Ionosphere Nested Grid (TING) model.

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