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Accounting for crustal magnetization in models of the core magnetic fieldThe problem of determining the magnetic field originating in the earth's core in the presence of remanent and induced magnetization is considered. The effect of remanent magnetization in the crust on satellite measurements of the core magnetic field is investigated. The crust as a zero-mean stationary Gaussian random process is modelled using an idea proposed by Parker (1988). It is shown that the matrix of second-order statistics is proportional to the Gram matrix, which depends only on the inner-products of the appropriate Green's functions, and that at a typical satellite altitude of 400 km the data are correlated out to an angular separation of approximately 15 deg. Accurate and efficient means of calculating the matrix elements are given. It is shown that the variance of measurements of the radial component of a magnetic field due to the crust is expected to be approximately twice that in horizontal components.
Document ID
19910061888
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Jackson, Andrew
(Harvard University Cambridge, MA, United States)
Date Acquired
August 14, 2013
Publication Date
December 1, 1990
Publication Information
Publication: Geophysical Journal International
Volume: 103
ISSN: 0955-419X
Subject Category
Geophysics
Accession Number
91A46511
Funding Number(s)
CONTRACT_GRANT: NAG5-918
CONTRACT_GRANT: NSF EAR-88-04618
Distribution Limits
Public
Copyright
Other

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