This data set contains the 240 coefficients of the POGO (8/69) spherical harmonics model of the Earth's main (core) magnetic field. The coefficients are for epoch 1960.0 and extend up to degree and order 10 in the constant and first derivative terms. POGO (8/69) continues the series of POGO models, using OGO 2, 4, and 6 satellite data up to May 1968. Improvements over the earlier POGO models result from the extended data base and from a more careful selection of magnetically quiet periods.
J. C. Cain and R. E. Sweeney, Magnetic Field Mapping of the Inner Magnetosphere, J. Geophys. Res. 75, 4360, 1970.