Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pepi...16p...1d&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 16, Issue 2, p. P1-P6.
Physics
Scientific paper
A comparison with the International Geomagnetic Reference Field for 1975 (IGRF 1975) of annual mean values in X, Y and Z from 130 magnetic observatories, carefully extrapolated to 1977 show large secular variation (SV) departures exceeding 20 nT/a over many parts of the world. In general, the SV departures in Z˙ are the greatest. Comparisons were made with a previous investigation for IGRF 1965, using similar data from 116 observatories. This shows that in Z˙ in Siberia, the IGRF went from an overestimate of 40 nT/a in 1965 to an underestimate exceeding 30 nT/a in 1977. Surprisingly the IGRF 1975 comparison shows extreme Z˙ departure exceeding 40 nT/a over a large part of North America. It is generally agreed that gross errors exist in the IGRF main field representation. The large errors arising in the time terms support the argument for the best possible discontinuous main field representation with time term modification, at least every five years.
Dawson E.
Newitt L. R.
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