Other
Scientific paper
Mar 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ep%26s...62..277m&link_type=abstract
Earth, Planets and Space, Volume 62, Issue 3, p. 277-286.
Other
Scientific paper
We present a method to model geomagnetic field requiring only a restricted number of measurements on magnetic survey satellite orbits. These points are chosen in an optimal -- or close to optimal -- manner relying on recent developments in the problem of numerical integration over spheres. The method allows us to compute a series of models at short time intervals, namely 10 days in the present study. At each of these close dates several models are computed from independent sets of data; their redundancy in turn provides a control of results thanks to which the selection of data -- for example, as a function of magnetic activity or latitude -- may be reduced. We find that the internal low degree Gauss coefficients derived from Oersted and Champ data, respectively, differ from one another by 1 or 2 nT. We then take as a second example of the method application a brief study of the so-called external field. We compare the first-degree axisymmetric field with the Dst index.
Khokhlov Alexei
Le Mouël Jean Louis
Shebalin Peter
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