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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 solutionsTwo suites of geomagnetic field models were generated at the request of Los Alamos National Lab. concerning Strategic Defense Initiative (SDI) research. The first is a progression of five models incorporating 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 (NM) area survey by Project Magnet with some additional post 1980 marine survey data, and finally DE-2 satellite data. These models are of 13th deg and order in their main field terms, and deg and order 10 in their first derivative temporal terms. The second suite consists of four models based solely upon post 1983.5 observatory and survey data. They are of deg and order 10 in main field and 8 in a first deg Taylor series. 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 deg crustal fields. Comparison of the power spectrum of the MGST (10/81) model with those of this series show good agreement.
Document ID
19910012341
Document Type
Technical Memorandum (TM)
Authors
Langel, Robert A. (NASA Goddard Space Flight Center Greenbelt, MD., United States)
Sabaka, T. J. (ST Systems Corp. Lanham, MD., United States)
Baldwin, R. T. (ST Systems Corp. Lanham, MD., United States)
Date Acquired
September 6, 2013
Publication Date
April 1, 1991
Subject Category
GEOPHYSICS
Report/Patent Number
NASA-TM-104541
NAS 1.15:104541
REPT-91E01682
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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