Mathematics – Logic
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24..413d&link_type=abstract
In its Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F p 413-414 (SEE N94-12015 01-91)
Mathematics
Logic
Dynamo Theory, Earth Mantle, Geomagnetism, Magnetic Anomalies, Magnetic Dipoles, Magnetic Field Inversions, Magnetic Fields, Magnetic Poles, Polarity, Boundaries, Earth Planetary Structure, Electric Fields, Geology, Temperature Gradients, Thermoelectricity
Scientific paper
There is evidence that the terrestrial magnetic field is connected with the Earth's mantle: (1) there are magnetic anomalies that do not take part in the westward drift of the main field, but are fixed with respect to the mantle; (2) the geomagnetic pole position flips in a particular way by preferred meridional paths during a reversal; and (3) magnetic polarity reversals are correlated with the activations of geological processes. These facts may be explained if we take into account that a significant horizontal temperature gradient can exist in the top levels of the liquid core because of the different thermoconductivity of the different areas of the core-mantle boundary. These temperature inhomogeneities can penetrate the core because fluxes along the core boundary (the thermal wind) can be strongly suppressed by a small redistribution of the chemical composition in the top of the core. The nonparallel gradients of the temperature, density, and composition on the top of the core create a curled electric field that produces a current and a magnetic field. This seed-field can be amplified by motions in the core. The resulting field does not forget the seed-field distribution and in this way the field on the Earth surface (that can be created only in regions with high conductivity, i.e. in the core) is connected with the core-mantle boundary. Contrary to the usual approach to the dynamo problem, we will take into account that the seed field of thermoelectric origin is acting not only at some initial moment of time but permanently.
No associations
LandOfFree
Polarity reversals and tilt of the Earth's magnetic dipole does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Polarity reversals and tilt of the Earth's magnetic dipole, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polarity reversals and tilt of the Earth's magnetic dipole will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1448060