HR: 1340h
AN: GP33C-1441    [Abstracts]
TI: Ocean circulation generated magnetic signals: Application to geomagnetic field modeling
AU: * Wardinski, I
EM: ingo@gfz-potsdam.de
AF: GFZ Potsdam, GFZ Potsdam, Section 2.3 Earth's Magnetic Field Telegrafenberg, Potsdam, D-14473, Germany
AU: Lesur, V
EM: lesur@gfz-potsdam.de
AF: GFZ Potsdam, GFZ Potsdam, Section 2.3 Earth's Magnetic Field Telegrafenberg, Potsdam, D-14473, Germany
AU: Kuvshinov, A
EM: kuvshinov@erdw.ethz.ch
AF: ETH Zürich, ETH Zürich Institut f. Geophysik HPP L 3.2 Schafmattstr. 30, Zürich, 8093, Switzerland
AU: Mandea, M
EM: mioara@gfz-potsdam.de
AF: GFZ Potsdam, GFZ Potsdam, Section 2.3 Earth's Magnetic Field Telegrafenberg, Potsdam, D-14473, Germany
AB: Recently, simulations have been carried out to estimate the strength of electric and magnetic signals generated by the steady motion (ocean circulation) of highly conducting oceans. The magnetic signals have been found to be on the order of several nT at the Earth's surface. The ocean circulation signals are especially pronounced in the high latitudes of the southern hemisphere, where the eastward current circulates without hitting continental landmass. In this study, we estimated the magnetic field generated by the ocean circulation and modelled it on a global scale using the spherical harmonics. We found that the energy spectrum of the expansion is dominated by rather high spherical harmonic degrees. Results of a spherical harmonic analysis are compared with recent spherical harmonic description of the lithospheric magnetic field. We seek to explain uncertainties in the lithospheric magnetic field models by oceanic signals, in order to improve current models of the geomagnetic field.
DE: 1515 Geomagnetic induction
DE: 1541 Satellite magnetics: main field, crustal field, external field
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2007 Fall Meeting