Anomalies in the secular variations in the main geomagnetic field in the context of the hierarchic dipole model

The developed dynamic model of the main geomagnetic field (MGF) includes the sources of three levels, which have existed and continuously changed during the 100-year period. The spatial-temporal dynamics of the secular variations in MGF has been considered based on this model. It has been indicated...

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Bibliographic Details
Published in:Geomagnetism and Aeronomy 2008-12, Vol.48 (6), p.812-821
Main Authors: Demina, I. M., Koroleva, T. Yu, Farafonova, Yu. G.
Format: Article
Language:English
Subjects:
Aeronomy
Earth and Environmental Science
Earth Sciences
Geomagnetic field
Geophysics
Geophysics/Geodesy
Magnetic fields
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Summary:The developed dynamic model of the main geomagnetic field (MGF) includes the sources of three levels, which have existed and continuously changed during the 100-year period. The spatial-temporal dynamics of the secular variations in MGF has been considered based on this model. It has been indicated that, at different times, the formation of anomalies (located in similar regions) depended on the total dynamics of different combinations of sources, including a change in the parameters of the dipoles of the secondorder smallness. Anomalies generated by the dynamics of the dipoles of the third-order smallness do not evidently manifest themselves in the total secular variations but are responsible for the specific shapes of isodynamic lines. Based on the stability and continuity of the constructed model, the conclusion is made that long-living turbulent flows of different scales can exist in the liquid core.
ISSN:0016-7932
1555-645X
0016-7940
DOI:10.1134/S0016793208060157