This data set contains the coefficients associated with the Gauss-normalized Legendre polynomials in the potential expansion for the Jensen-Cain geomagnetic field model. The coefficients are for epoch 1960.0 and are based on about 74,000 ground observations of H and F since 1940. There are 48 non-zero coefficients extending up to order and degree 6. Secular variations of the field are not considered, i.e., no time derivative coefficients. The oblateness of the Earth has not been taken into account in the determination of the coefficients. Compared with more recent models, the accuracy of this model is poor. It was, however, widely used in the calculation of geomagnetic coordinates for the early satellite missions. Geomagnetic field parameters can be generated with the FIELDG (#PG-11A) program.
Availability: (1) Retrievable from CCMC's anonymous FTP site.
D. C. Jensen and J. C. Cain, An Interim Geomagnetic Field, J. Geophys. Res. 67, 3568, 1962.