Physics
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...54..332v&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 54, Issue 3-4, p. 332-339.
Physics
1
Scientific paper
When compiling magnetic data that have been collected over several decades, the accuracy of the magnetic reference fields that are used to reduce the data to a common datum-level becomes an important factor. Definitive magnetic reference fields have been defined at 5-year intervals. In this study we evaluated these reference fields by applying them to marine magnetic data that have been collected off the Canadian east coast in the period 1963-1984. For 35-50° N, the anomalies for the period 1970-1975 were found to be ~ 50 nT higher than those obtained in other periods. A cross-over analysis performed on the whole data set yielded ~ 60 000 cross points and confirmed these results.
As the source of the anomalies are unvarying, we conclude from these observations that the magnetic reference fields in this part of the world do not accurately correct for the time-varying component of the magnetic field. This has serious consequences for magnetic data compilations; when not treated in a generally accepted fashion, these inaccuracies could lead to user-defined corrections to the reference fields, which would be a step in the wrong direction.
Macnab Ron
Verhoef Jacob
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