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Download Vertical component of the lithospheric magnetic field
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http://geomag.org Sixth generation lithospheric magnetic field model, MF6, from CHAMP satellite magnetic measurements S. Maus ([email protected]) and C. Manoj, CIRES, University of Colorado F. Yin, M. Rother, J. Rauberg, I. Michaelis, C. Stolle, and H. Lühr, GeoForschungsZentrum Potsdam R. Dietmar Müller, University of Sydney Vertical component of the lithospheric magnetic field at the surface of the Earth for model MF6, with ocean-age isochrons of Müller et al. (2007) overlain 0.6 MF6 global marine and aeromag grid 0.8 degree correlation 0.5 power (nT 2 ) The CHAMP satellite continues to provide highly accurate magnetic field measurements with decreasing orbital altitudes (<350km) at solar minimum conditions. A promising new CHAMP data product has become available, which provides the total field with one order of magnitude smaller noise amplitudes. The product is inferred from suitably merged Fluxgate and Overhauser magnetometer data and takes advantage of the low-noise Fluxgate measurements in the short-period range (<900sec, or <6000km wavelength). The new data set was used here to generate an improved lithospheric magnetic field model MF6 to degree 120. Conclusions Using a new scalar data product from the latest readings of the CHAMP FGM magnetometer, we have resolved the lithospheric magnetic field to degree 120, corresponding to 333 km wavelength. The data were found to be sensitive to crustal field variations up to degree 150 (down to 266 km wavelength), but a clean separation of the lithospheric signal from ionospheric and magnetospheric noise sources was only achieved to degree 120. The MF6 model is the first satellite-based magnetic model to resolve the direction of oceanic magnetic lineations, revealing the age structure of oceanic crust. Model coefficients, grids and images are available at http://geomag.org/models/MF6.html. 1 Pomme-4 0.4 0.3 0.6 0.4 0.2 0.2 0.1 0 16 MF6-0 0 54 spherical harmonic degree 120 150 The MF6 model was synthesized from degrees 55-120 of an initial model MF6-0 and degrees 16-54 from Pomme-4 (http://geomag.org/models/pomme4.html) 20 40 60 80 100 120 spherical harmonic degree 140 Degree correlation between MF6-0 and a global grid of independent marine and aeromagnetic data References Maus, S., H. Lühr, M. Rother, K. Hemant, G. Balasis, P. Ritter, and C. Stolle (2007), Fifth-generation lithospheric magnetic field model from CHAMP satellite measurements, Geochem. Geophys Geosyst., 8, Q05013, doi:10.1029/2006GC001521. Müller, R. D., M. Sdrolias, C. Gaina, and W. R. Roest (2007), Age, spreading rates and spreading asymmetry of the world's ocean crust, submitted to Geochem. Geophys Geosyst.