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Diurnal polar motionAn analytical theory is developed to describe diurnal polar motion in the earth which arises as a forced response due to lunisolar torques and tidal deformation. Doodson's expansion of the tide generating potential is used to represent the lunisolar torques. Both the magnitudes and the rates of change of perturbations in the earth's inertia tensor are included in the dynamical equations for the polar motion so as to account for rotational and tidal deformation. It is found that in a deformable earth with Love's number k = 0.29, the angular momentum vector departs by as much as 20 cm from the rotation axis rather than remaining within 1 or 2 cm as it would in a rigid earth. This 20 cm separation is significant in the interpretation of submeter polar motion observations because it necessitates an additional coordinate transformation in order to remove what would otherwise be a 20 cm error source in the conversion between inertial and terrestrial reference systems.
Document ID
19730023552
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Mcclure, P. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 2, 2013
Publication Date
September 1, 1973
Subject Category
Geophysics
Report/Patent Number
X-592-73-259
NASA-TM-X-70470
Accession Number
73N32284
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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