Influence of gravity field uncertainties on the results from POGO and Magsat geomagnetic surveys

Details Influence of gravity field uncertainties on the results from POGO and Magsat geomagnetic surveys Influence of gravity field uncertainties on the results from POGO and Magsat geomagnetic surveys

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8.1246t&link_type=abstract

Geophysical Research Letters, vol. 8, Dec. 1981, p. 1246-1248.

Computer Science

Sound

3

Geomagnetism, Gravitational Fields, Magnetic Surveys, Magsat Satellites, Pogo, Gravity Anomalies, Magnetic Anomalies, Orbit Perturbation, Satellite Sounding

Scientific paper

Errors in the gravity models used in satellite position calculations are examined as a possible source of the 0 to 100% variance found between POGO and Magsat magnetic data and the extrapolations of aerial magnetic survey data to satellite heights. For POGO data obtained over the New York Bight region using a relatively poor gravity field (a hybrid spherical harmonic model of degree 7 and order 6 with three higher order resonance terms), the magnitude of the error in the satellite height component is found to be sufficient to account for the amplitude of the discrepancy, however the frequency of the quasi-periodic orbital error is too large to explain the localized nature of the differences. For the case of the Magsat satellite, in which a more accurate gravity model was used, it is found that a 30 mgal gravitational anomaly distributed over a 5 x 5 deg area will produce insufficiently large position errors to account for the variations. The agreement between the two sets of satellite data in the New York Bight region suggests either a consistent error in satellite measurements, or problems with the reduction and processing of the aeromagnetic data.

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