HR: 1340h
AN: GP33D-1599    [Abstracts]
TI: Sixth generation lithospheric magnetic field model, MF6, from CHAMP satellite magnetic measurements
AU: * Maus, S
EM: stefan.maus@noaa.gov
AF: CIRES, University of Colorado, UCB 216, Boulder, CO 80309, United States
AU: * Maus, S
EM: stefan.maus@noaa.gov
AF: NOAA/NGDC, 325 Broadway, Boulder, CO 80305, United States
AU: Fan, Y
EM: yinfan@gfz-potsdam.de
AF: GeoForschungsZentrum, Telegrafenberg, Potsdam, 14473, Germany
AU: Manoj, C
EM: manoj.c.nair@noaa.gov
AF: CIRES, University of Colorado, UCB 216, Boulder, CO 80309, United States
AU: Manoj, C
EM: manoj.c.nair@noaa.gov
AF: NOAA/NGDC, 325 Broadway, Boulder, CO 80305, United States
AU: Rother, M
EM: rother@gfzj-potsdam.de
AF: GeoForschungsZentrum, Telegrafenberg, Potsdam, 14473, Germany
AU: Rauberg, J
EM: rauberg@gfz-potsdam.de
AF: GeoForschungsZentrum, Telegrafenberg, Potsdam, 14473, Germany
AU: Stolle, C
EM: stolle@gfz-potsdam.de
AF: GeoForschungsZentrum, Telegrafenberg, Potsdam, 14473, Germany
AU: Luhr, H
EM: hluehr@gfz-potsdam.de
AF: GeoForschungsZentrum, Telegrafenberg, Potsdam, 14473, Germany
AB: 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. While the low-noise Fluxgate measurements are used in the short-period range (<900sec, or <6000km wavelength), we take advantage of the high stability provided by the Overhauser for the longer periods. The new data set is used for generating an improved lithospheric magnetic field model (MF6). Although MF6 is still in production at the time of writing this abstract, we anticipate significant benefits in terms of resolving small- scale low-amplitude crustal features from the new data. Further improvements include a new correction for steady ocean circulation and an expansion to higher spherical harmonic degrees of the model.
UR: http://geomag.org
DE: 1517 Magnetic anomalies: modeling and interpretation
DE: 1541 Satellite magnetics: main field, crustal field, external field
DE: 1545 Spatial variations: all harmonics and anomalies
DE: 1550 Spatial variations attributed to seafloor spreading (3005)
DE: 1594 Instruments and techniques
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2007 Fall Meeting