This data set contains the 195 coefficients of the MGST (6/80) spherical harmonics model of the Earth's main (core) magnetic field. The coefficients are for epoch 1979.85 and extend to degree and order 13. No secular variation terms are included. This model was one of the first published results of the MAGSAT satellite mission. It is based on initial vector measurements for the magnetically quiet days of November 5-6, 1979. The authors included also statistically significant external terms of degree and order 1 describing the effect of external field sources.
Availability: (1) from NSSDC's Request Office on diskette for use on PCs; (2) retrievable from NSSDC's anonymous FTP site.
NSSDC ID: MG-1BA
R. A. Langel, Initial Geomagnetic Field Model from MAGSAT, NASA TM-80679, Washington, D.C., 1980.
R. A. Langel, R. H. Estes, G. D. Mead, E. B. Fabiano, and E. R. Lancaster, Initial Geomagnetic Field Model from MAGSAT Vector Data, Geophys. Res. Lett. 7, 793, 1980.
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NASA Official: Dr. Robert McGuire, Head of the Space Physics Data Facility