Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa21c0370s&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SA21C-0370
Physics
2409 Current Systems (2708), 1515 Geomagnetic Induction, 0619 Electromagnetic Theory, 0644 Numerical Methods
Scientific paper
Accurate calculation of the electric and magnetic fields induced in the Earth by time-varying ionospheric currents is an important step in computing the strength of geomagmatically induced currents (GICs) and in accurately inferring the strength and location of the source currents from ground-based magnetometers. The complexity of the Earth's conductivity adds to the difficulty of the problem, particularly near coastal regions where the conductivity of salt water is several orders of magnitude larger than that of the surrounding land mass. We demonstrate the use of a numerical technique known as the method of auxiliary sources (MAS) to calculate the induced electric and magnetic fields, resulting from a uniform source, near a 2D modeled coast. Dependence of the resulting fields on frequency, conductivity, and geometry are shown.
Shepherd Simon G.
Shubitidze Fridon
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