Derivation of A Geomagnetic Model to N = 63

作者：Joseph C. Cain, Zhigang Wang, Christopher Kluth, Dave Schmitz · 发表于：Geophysical Journal International · 年份：1989 · DOI：10.1111/j.1365-246x.1989.tb00513.x · 被引用次数：95 · 研究领域：Geomagnetism and Paleomagnetism Studies、Geophysics and Gravity Measurements、Solar and Space Plasma Dynamics

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 first updated with new secular change data for the interval 1979 September-1980 June combined with the previously obtained analysis set of Magsat vector data. Residuals of a new selection of observed vector Magsat data were then analysed by solving for ionospheric-magnetospheric variations and removing their effect. the reduced Br, components were then averaged over approximately 3° × 3° blocks of latitude and longitude, and coefficients derived using the Neumann method. These coefficients, when combined with those from the least squares solution, were seen to show significantly greater detail in the structure of the geomagnetic field which appeared to be realistic to n = 50.