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A geomagnetic field spectrumA spherical harmonic model of the earth's internal magnetic field of degree and order 23 is derived from selected Magsat data, and its power spectrum, computed with terms developed by Mauersberger (1956) and Lowes (1974), is found to exhibit a change of a slope at n = 14 which is interpreted as an indication that the core field dominates at values lower than 13 while the crust field dominates above a value of 15. The representations of the two portions of the spectrum obtained can be used to establish order-of-magnitude inaccuracies due to both crustal fields and the inability to observe core field wavelengths beyond n = 13, at which point they are obscured by the crustal field, in core field models.
Document ID
19820047244
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Langel, R. A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Estes, R. H.
(Business and Technological Systems, Inc. Seabrook, MD, United States)
Date Acquired
August 10, 2013
Publication Date
April 1, 1982
Publication Information
Publication: Geophysical Research Letters
Volume: 9
Subject Category
Geophysics
Accession Number
82A30779
Distribution Limits
Public
Copyright
Other

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