Physics
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29n..47m&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 14, pp. 47-1, CiteID 1702, DOI 10.1029/2001GL013685
Physics
17
Geomagnetism And Paleomagnetism: Spatial Variations (All Harmonics And Anomalies), Geomagnetism And Paleomagnetism: Instruments And Techniques, Geomagnetism And Paleomagnetism: Reference Fields (Regional, Global), Magnetospheric Physics: Ring Current
Scientific paper
Satellite magnetic anomaly maps derived by different techniques from Magsat/POGO data vary by more than a factor of 2 in the deduced strength of the lithospheric magnetic field. Here, we present a first anomaly map from new CHAMP scalar magnetic field data. After subtracting a recent Ørsted main and external field model, we remove remaining unmodeled large-scale external contributions from 120° track segments by subtracting a best-fitting uniform field. In order to preserve N/S trending features, the data are not filtered along-track. Direct integration of the spherically gridded data yields the final degree 14-65 spherical harmonic expansion of the total intensity anomaly at the mean satellite altitude of 438 km. Apart from enhanced long wavelength features and a smoother general appearance, our initial map is strikingly similar to one of the lower strength Magsat/POGO maps.
Haak Volker
Holme Richard
Lühr Hermann
Maus Stefan
Olsen Nils
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