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Estimating the Crustal Power Spectrum From Vector Magsat Data: Crustal Power SpectrumThe Earth's magnetic field can be subdivided into core and crustal components and we seek to characterize the crustal part through its spatial power spectrum (R(sub l)). We process vector Magsat data to isolate the crustal field and then invert power spectral densities of flight-local components along-track for R(sub l) following O'Brien et al. [1999]. Our model (LPPC) is accurate up to approximately degree 45 (lambda=900 km) - this is the resolution limit of our data and suggests that global crustal anomaly maps constructed from vector Magsat data should not contain features with wavelengths less than 900 km. We find continental power spectra to be greater than oceanic ones and attribute this to the relative thicknesses of continental and oceanic crust.
Document ID
20000068455
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Lowe, David A. J. (Scripps Institution of Oceanography La Jolla, CA United States)
Parker, Robert L. (Scripps Institution of Oceanography La Jolla, CA United States)
Purucker, Michael E. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Constable, Catherine G. (Scripps Institution of Oceanography La Jolla, CA United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2000
Subject Category
Geophysics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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