Brief Description:
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) from NSSDC's Request Office on diskette or tape; (2) retrievable from NSSDC's anonymous FTP site.
NSSDC ID: #MG-11A
References:
D. C. Jensen and J. C. Cain, An Interim Geomagnetic Field, J. Geophys. Res. 67,
3568, 1962.
| If you have questions/comments about the various models available from NSSDC, contact:Dr. Dieter K. Bilitza. If you have any questions/comments about magnetic field models and Web access to run models, contact: Dr. Natalia Papitashvili, National Space Science Data Center, Mail Code 630, NASA/Goddard Space Flight Center, Greenbelt, MD 20771 |
NASA Official: Dr. Robert McGuire, Head of the Space Physics Data Facility
Last Updated: 7 November 2003, NEP