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Correction and update to 'The earth's C21 and S21 gravity coefficients and the rotation of the core'Wahr (1987) used satellite constraints on C21 and S21 (the spherical harmonic coefficients of the earth's external gravitational potential) to infer certain properties of the core and core/mantle boundary. It is shown here, contrary to the claim by Wahr, that it is not possible to use C21 and S21 to placed bounds on the core's products of inertia. As a result, Wahr's constraints on the l = 2, m = 1 components of the core/mantle boundary topography and on the angular orientation of the inner core with respect to the earth's rotation vector are not justified. On the other hand, Wahr's conclusions about the time-averaged torque between the core and mantle and the resulting implications for the l = 2, m = 1 components of fluid pressure at the top of the core can be strengthened. Wahr's conclusions about the mean rotational flow in the core are unaltered.
Document ID
19900050692
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Wahr, John
(Colorado, University; Cooperative Institute for Research in Environmental Sciences, Boulder, United States)
Date Acquired
August 14, 2013
Publication Date
June 1, 1990
Publication Information
Publication: Geophysical Journal International
Volume: 101
ISSN: 0955-419X
Subject Category
Geophysics
Accession Number
90A37747
Funding Number(s)
CONTRACT_GRANT: NSF EAR-88-04791
CONTRACT_GRANT: NAG5-485
Distribution Limits
Public
Copyright
Other

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