NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Constraints on magnetic energy and mantle conductivity from the forced nutations of the earthThe possibility of a presence of a conducting layer at the base of the mantle, as suggested by Knittle and Jeanloz (1986, 1989), was examined using observations of the earth's nutations. Evidence favoring the presence of a conducting layer is found in the effect of ohmic dissipation, which can cause the amplitude of the earth's nutation to be out-of-phase with tidal forcings. It is shown that the earth's magnetic field can produce observable signatures in the forced nutations of the earth when a thin conducting layer is located at the base of the mantle. The present theoretical calculations are compared with VLBI determinations of forced nutations.
Document ID
19930037357
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Buffett, Bruce A.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Date Acquired
August 16, 2013
Publication Date
December 10, 1992
Publication Information
Publication: Journal of Geophysical Research
Volume: 97
Issue: B13
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
93A21354
Funding Number(s)
CONTRACT_GRANT: NAG5-538
CONTRACT_GRANT: NSF EAR 86-18989
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available