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On the Possibilities of Predicting Geomagnetic Secular Variation with Geodynamo Modeling

Author
Sabaka, Terrance
Published
[2004].
Physical Description
1 electronic document
Additional Creators
Tangborn, Andrew and Kuang, Wei-Jia
Online Version

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Summary
We use our MoSST core dynamics model and geomagnetic field at the core-mantle boundary (CMB) continued downward from surface observations to investigate possibilities of geomagnetic data assimilation, so that model results and current geomagnetic observations can be used to predict geomagnetic secular variation in future. As the first attempt, we apply data insertion technique to examine evolution of the model solution that is modified by geomagnetic input. Our study demonstrate that, with a single data insertion, large-scale poloidal magnetic field obtained from subsequent numerical simulation evolves similarly to the observed geomagnetic variation, regardless of the initial choice of the model solution (so long it is a well developed numerical solution). The model solution diverges on the time scales on the order of 60 years, similar to the time scales of the torsional oscillations in the Earth's core. Our numerical test shows that geomagnetic data assimilation is promising with our MoSST model.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 20040082342.
Terms of Use and Reproduction
Copyright, Distribution as joint owner in the copyright.
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