Physics
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.2539p&link_type=abstract
Journal of Geophysical Research, vol. 81, May 10, 1976, p. 2539-2542.
Physics
3
Geomagnetism, Mathematical Models, Secular Variations, Computer Techniques, Harmonic Analysis, Mapping, Statistical Analysis
Scientific paper
A new model of the near-surface geomagnetic main field and its secular variation has been derived. The main field part, a degree 12 spherical harmonic series of 168 internal source terms, was derived from 1248 representative values having a nearly even distribution over the earth. These were created by an intermediate analysis of approximately 100,000 reduced original observations made since 1939. The secular variation part, a series of 80 linear time terms, was derived from observatory data exclusively. The model is the basis for the 1975 edition of the U.S. World Magnetic Charts.
Fabiano E. B.
Peddie Norman W.
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