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A preliminary harmonic spline model from Magsat dataA preliminary main field model for 1980 derived from a carefully selected subset of Magsat vector measurements, using the method of harmonic splines, is presented. This model (PHS /80/) for preliminary harmonic splines is the smoothest model (in the sense that the rms radial field at the core surface is minimum) consistent with the measurements (with an rms misfit of 10 nT to account for crustal and external fields as well as noise in the measurement procedure). Therefore PHS (80) is more suitable for studies of the core than models derived with the traditional least squares approach (e.g., GSFC /9/80/). A comparison is conducted of the characteristics of the harmonic spline spectrum, topology of the core field and especially the null-flux curves (loci where the radial field is zero) and the flux through patches bounded by such curves. PHS (80) is less complex than GSFC (9/80) and is therefore more representative of that part of the core field that the data constrain.
Document ID
19860029411
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Shure, L.
(Woods Hole Oceanographic Institution MA, United States)
Parker, R. L.
(California, University La Jolla, United States)
Langel, R. A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 12, 2013
Publication Date
November 10, 1985
Publication Information
Publication: Journal of Geophysical Research
Volume: 90
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
86A14149
Funding Number(s)
CONTRACT_GRANT: N00014-82-C-0019
Distribution Limits
Public
Copyright
Other

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