Resolving power of satellite magnetic data for lithospheric field characterization

Details Resolving power of satellite magnetic data for lithospheric field characterization Resolving power of satellite magnetic data for lithospheric field characterization

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmgp31a0824a&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #GP31A-0824

Physics

5440 Magnetic Fields And Magnetism, 1545 Spatial Variations (All Harmonics And Anomalies), 1594 Instruments And Techniques

Scientific paper

The isolation of the magnetic field of the martian and terrestrial lithospheres is subject to several limitations, such as the altitude of the observations, the presence of external fields that overlap the lithospheric field, and the accuracy of the observing system. We compare and contrast the situation at the two planets, Mars and the Earth. The altitude effect at Mars is more severe than that at the Earth, because of the different curvatures of the two planets. We examine five types of constraints that can be used to place some bounds on the resolving power of magnetic data: 1) comparison of radial and along-track fields via the Hilbert transform, 2) comparison of independently determined global spherical harmonic power spectra, 3) auto and cross-spectral estimates from the radial components of nearby passes, 4) forward modeling approaches, and 5) End-to-End simulations. Wavelengths less than the altitude of the observations are strongly suppressed at both planets, more so for Mars. Some improvements can be made with a multi-instrument gradiometer configuration in the future.

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