Derivation of a geomagnetic model to n = 63

Details Derivation of a geomagnetic model to n = 63 Derivation of a geomagnetic model to n = 63

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989geoj...97..431c&link_type=abstract

Geophysical Journal (ISSN 0955-419X), vol. 97, June 1989, p. 431-441. Research supported by USGS.

Physics

41

Geomagnetism, Magnetic Field Configurations, Neumann Problem, Least Squares Method, Magsat Satellites, Mathematical Models, Numerical Integration, Secular Variations

Scientific paper

A high degree model of the geomagnetic field is derived using an integral technique to extend coefficients beyond the limits allowable with least squares approaches. A previously derived model to n = 29 was updated with new secular change data for the interval September 1979 to June 1980 combined with the analysis set of Magsat vector data. The reduced B(r) components were averaged over approximately 3 x 3 deg blocks of latitude and longitude, and coefficients derived using the Neumann method. These coefficients, when combined with those from the least squares solution, show significantly greater detail in the structure of the geomagnetic field which appeared to be realistic to n = 50.

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