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Detailed Reference Information |
Maus, S., Rother, M., Holme, R., Lühr, H., Olsen, N. and Haak, V. (2002). First scalar magnetic anomaly map from CHAMP satellite data indicates weak lithospheric field. Geophysical Research Letters 29: doi: 10.1029/2001GL013685. issn: 0094-8276. |
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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 ¿rsted 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. |
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Abstract |
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Keywords
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 |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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