Lesur, V.; Macmillan, S.; Thomson, A.W.P.. 2006 Deriving main field and secular variation models from synthetic Swarm satellite and observatory data. Earth, Planets and Space, 58 (4). 409-416.
simulator can be recovered when relatively simple geomagnetic field models are fitted to synthetic Swarm satellite
and observatory data. In particular we demonstrate the potential benefits of Swarm by deriving models without
these data. From two years of observatory data, the underlying secular variation model is recovered up to about
spherical harmonic degree 8. This maximum degree is higher than was expected but increases to 10 when satellite
data are also used. The constant part of the geomagnetic field model is recovered to at least degree 17. These
results improve when a better statistical treatment of the data errors is made, a slightly more complex field model
is fitted, or when five years of data are used.
Key words: Geomagnetism, geomagnetic field, swarm.
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