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Geomagnetic model investigations for 1980 - 1989: A model for strategic defense initiative particle beam experiments and a study in the effects of data types and observatory bias solutions

Two suites of geomagnetic field models were generated in response to a request from Dr. David Chamberlain of Los Alamos Laboratories at White Sands Missile Range in New Mexico concerning Strategic Defense Initiative (SDI) research. The first suite, denoted as the GSFC(5/89-X) series, is a progression of five models which incorporate MAGSAT data and data from a sequence of batches as a priori information. The batch sequence is: post 1979.5 observatory data, post 1980 land survey and selected aeromagnetic and marine survey data, a special White Sands area survey by Project Magnet with some additional post 1980 marine survey data, and, finally DE-2 satellite data. These models are of 13th degree and order in their main field terms and degree and order i0 in their first derivative temporal terms. A first degree model for the external field with terms proportional to Dst, is included. The second suite, denoted as the GSFC(4/89-X) series, consists of four models based solely upon post 1983.5 observatory and survey data. They are of degree/order i0 in main field and 8 in a first degree Taylor series. Certain models also include three vector biases for each observatory where possible. The models in this suite differ to the extent that these biases were either not modeled, applied but not adjusted, or applied and adjusted. A comprehensive error analysis was applied to both series, which accounted for error sources such as the truncated core and crustal fields, and the neglected Sq and low-degree crustal fields. Comparison