Higher harmonic effects of the earth's gravitational field from post-glacial rebound as observed by Lageos

Details Higher harmonic effects of the earth's gravitational field from post-glacial rebound as observed by Lageos Higher harmonic effects of the earth's gravitational field from post-glacial rebound as observed by Lageos

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10.1085a&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 10, Nov. 1983, p. 1085-1087. NSF-supported research.

Physics

16

Earth Gravitation, Glaciers, Gravitational Effects, Gravitational Fields, Harmonic Analysis, Satellite Observation, Satellite Perturbation, Earth Observations (From Space), Geopotential, Lageos (Satellite), Orbit Perturbation, Periodic Variations, Secular Variations, Spherical Harmonics, Zonal Harmonics

Scientific paper

Recently, long-term orbital data from the artificial satellite Lageos have been analyzed to determine the rate of post-glacial rebound. Rubincam (1983) has compared the observed values against values derived from two realistic earth models (Wu-Peltier L1,L2), working with the second harmonic mode of excitation. The data support model L1, with a uniform mantle viscosity of 10 to the 22nd poise, over L2, with a lower mantle viscosity of 10 to the 23rd poise. The higher degree harmonic contributions are found to be significant, and considerably strengthen the support for model L1. Such calculations are performed using the same parameter values for glaciation as Rubincam, and also values due to Peltier and coworkers (1982). It is also shown that a similar analysis of a data from the satellite Starlette is less likely to be as definitive as analysis of Lageos data, since there are significant contributions from very high harmonics, indicating that the behavior of the earth must be known in much greater detail.

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