Physics
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.4009t&link_type=abstract
Geophysical Research Letters, Volume 27, Issue 24, p. 4009-4012
Physics
11
Mineralogy And Petrology: Meteorites, Mineralogy And Petrology: Planetary Mineralogy And Petrology, Mineral Physics: High-Pressure Behavior, Mineral Physics: X Ray, Neutron, And Electron Spectroscopy And Diffraction
Scientific paper
We show that magnetic fields induced by a near-earth ionospheric source can produce, at a satellite altitude of 400 km, an induced magnetic anomaly field with an amplitude of 2-3 nT at dawn and dusk local times and 3-4 nT at noon local time. Our results are based on an earth model which has an upper 4 km thick shell with a laterally varying electrical conductivity representing the distribution of continents and oceans. The upper shell overlies a one-dimensional mantle with a radially varying electrical conductivity. In some regions, the induced anomaly field does not change sign between dawn and dusk and appears static when sampled by a satellite such as MAGSAT. This induced anomaly field could explain some of the weak oceanic static anomalies observed in satellite global magnetic anomaly maps.
Grammatica Naphsica
Tarits Pascal
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