Nonlinear Modeling of the High-Latitude Geomagnetic Field and dB/dt

Details Nonlinear Modeling of the High-Latitude Geomagnetic Field and dB/dt Nonlinear Modeling of the High-Latitude Geomagnetic Field and dB/dt

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm13a0317v&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM13A-0317

Physics

2784 Solar Wind/Magnetosphere Interactions, 2788 Magnetic Storms And Substorms (7954), 2790 Substorms, 7904 Geomagnetically Induced Currents, 7924 Forecasting (2722)

Scientific paper

Two dynamic models, one for the time-dependence of the high-latitude ground magnetic field and one for its time rate of change, dB/dt, are presented. Local models for positions on an annular grid are regressed from magnetic-field measurements taken at the IMAGE meridional array. The nonlinear response at high activity is represented by local-linear models which are driven by real-time solar wind/IMF datastreams. We report the field response during isolated substorms and the great storms of October-November 2003. In those events the model prediction error for the field and its time rate of change is measured as a function of geomagnetic coordinates and activity level. Based on the predicted dB/dt we estimate the GIC disturbance level and compare with GIC measurements at the Finnish power grid.

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