Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991eouc.rept..226a&link_type=abstract
In ESA, Report of the Earth Observation User Consultation Meeting p 226-239 (SEE N92-22826 13-42)
Physics
Geodynamics, Geomagnetism, Lithosphere, Magnetic Fields, Satellite-Borne Instruments, Earth Magnetosphere, Earth Rotation, Environment Management, Recommendations
Scientific paper
The evolution of the environment at the surface of the Earth is inherently coupled with processes and forces taking place below this surface, sometimes on the very deep interior of the planet. Very few tools are available to probe that interior. The analysis of natural variations in space and time of the Earth's magnetic field, one of the most pervasive phenomena on the Earth, is one of them. Three sources contribute to the magnetic field near the Earth's surface: electric currents in the core, magnetization in the upper lithosphere and electric currents outside the Earth, together with their induced counterparts on the inside. The study of the geomagnetic field will thus have a substantial impact on the degree of understanding of the processes taking place in the Earth's interior by providing an insight into every single layer of the planet. Current knowledge of the following is reviewed: the dynamics of the Earth's deep interior; the Earth rotation, polar motion and core mantle coupling; the structure of the continental lithosphere and evolution of continents; and earthquake prediction. Parameters to be measured through space techniques include the secular variation, external field variations, lithospheric anomaly field, and electromagnetic variations of seismic and volcanic origin. The contribution given by space techniques and recommendations for spaceborne instrumentation are discussed.
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