Mathematics – Logic
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh52a..15s&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SH52A-15
Mathematics
Logic
2722 Forecasting, 5421 Interactions With Particles And Fields, 0600 Electromagnetics, 2409 Current Systems (2708)
Scientific paper
The end result of a long chain of geomagnetic events beginning at the Sun is the induction of currents in conductors near the surface of the Earth. These so-called Geomagnetically Induced Currents (GICs) can cause serious effects to the technological systems in which they flow. We are developing an integrated space weather model to predict the occurrence of the large electric and magnetic fields associated with large GICs. Our model uses real-time data from the ACE satellite, the observed solar EUV flux, and the Lyon-Feder-Mobarry (LFM) global MHD code to calculate the current density distribution in the ionosphere above North America in near-real-time. Two internal models, the Complex Image Method (CIM) and a model that solves the full Maxewell's Equations using a Finite Difference Time Domain method (FDTD) are used with several different forms of the Earth's conductivity structure to calculate the electric and magnetic fields at the surface of the Earth. Our goal is to develop an integrated model that accurately predicts the occurrence of large GICs over North America with >15 min warning. The model is currently in the development and validation stages and we will show comparisons of the different internal models to calculations using the Biot-Savart law and to ground observations of the magnetic fields.
Lotko William
Lyon John G.
Pulkkinen Aappo
Shepherd Simon G.
Shubitidze Fridon
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