A comparison between GEOS 1 magnetic field measurements and some models of the geomagnetic field
Abstract
Four magnetospheric field models in the range 4.4 to 7 RE on the dayside of the magnetosphere and for latitudes close to the xy GSM plane were compared with GEOS 1 data. The Olsen-Pfitzer 1976 (OP76) model, which includes all kinds of distributed currents in the magnetosphere and the tilt of Earth's magnetic dipole gives the best results: 2% to 3% difference from experimental data on field value and direction. The Mead-Fairfield (MF) model, derived by making least squares fits to magnetic measurements taken in the interval 6 to 8 RE and 13 to 15 RE performs well. Since near-Earth data indicate a scarcity of points near the magnetic equatorial plane, extrapolated values of the MF model were used. The OP76 model does not take into account the effects of the interplanetary magnetic field on the magnetosphere; this could be the reason of the residual differences with the GEOS 1 data.
- Publication:
-
Unknown
- Pub Date:
- April 1983
- Bibcode:
- 1983cbgm.rept.....A
- Keywords:
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- Geomagnetism;
- Geos 1 Satellite;
- Mathematical Models;
- Earth Magnetosphere;
- Interplanetary Magnetic Fields;
- Magnetic Dipoles;
- Magnetic Flux;
- Geophysics