High-Latitude Geoelectric Fields Given by MHD Simulations

Details High-Latitude Geoelectric Fields Given by MHD Simulations High-Latitude Geoelectric Fields Given by MHD Simulations

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm31b0780s&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM31B-0780

Physics

1515 Geomagnetic Induction, 2409 Current Systems (2708), 2708 Current Systems (2409), 2736 Magnetosphere/Ionosphere Interactions

Scientific paper

Ionospheric currents of geomagnetic origin give rise to an electrostatic potential at the surface of the Earth. Gradients in such a potential can cause large electric currents in conductors located at the surface of the Earth in the high-latitudes, often called geomagnetically induced currents. The horizontal geoelectric field is calculated at the surface of the Earth using the ionospheric currents derived from the Lyon-Feder-Mobarry global MHD model, the complex image method, and a layered conductivity structure model of the Earth. By using real-time MHD simulations that utilize observations of the upstream solar wind it will be possible to predict the onset of geomagnetically induced currrents with a ~30 minute warning.

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