Secular variation of Earth's gravitational harmonic J2 coefficient from Lageos and nontidal acceleration of Earth rotation

  title={Secular variation of Earth's gravitational harmonic J2 coefficient from Lageos and nontidal acceleration of Earth rotation},
  author={Charles Finney Yoder and J. G. Williams and Jean O. Dickey and Bob E. Schutz and R. J. Eanes and Byron D. Tapley},
Analysis of 5½ years of Lageos satellite range data reveal significant residual nodal signatures: an acceleration and annual and semiannual periods. These signatures primarily reflect variations in the zonal gravitational harmonic J2 coefficient and hence the polar moment of inertia. The implied decrease of \[Jdot]2=−3×10−11 yr−1 is consistent with both historical observations of the nontidal acceleration of the Earth's rotation and models of viscous rebound of the solid Earth from the decrease… 

Constraint on deep mantle viscosity from Lageos acceleration data

Recently reported analyses of 5½ yr of orbital data for the laser geodynamics satellite (Lageos) have revealed a residual acceleration in the node of its orbit in the amount −14.7±1.3 m arc s yr−2.


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Causes of fluctuations in the rotation of the Earth

  • M. Rochester
  • Geology
    Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences
  • 1984
Over the last decade considerable progress has been made in closing the gap between geophysical theory and the observed changes in the Earth's spin rate and polar motion, which are affected by the



Tidal variations of earth rotation

We have rederived the periodic variations of the earth's rotation due to the tidal deformation of the earth by the sun and moon and included all terms with amplitudes ≥0.002 milliseconds (1 mm). This

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We extend a theorem by Darwin on the deformation invariance of Tr |, the trace of the earth's inertia tensor, and clarify some obscure points in the geophysical literature on the subject. By

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Summary. The viscoelastic response of the Earth to the mass displacements caused by late Pleistocene deglaciation and concomitant sea level changes is shown to be capable of producing the secular

Continental lithospheric thickness and deglaciation induced true polar wander

The secular drift of the earth’s rotation pole, which is evident in ILS data, is a memory of the planet of the last deglaciation event of the current ice age. In order to fit the observed rate and

On the secular decrease in the semimajor axis of Lageos's orbit

The semimajor axis of the Lageos satellite's orbit is decreasing secularly at the rate of 1.1 mm day−1. Ten possible mechanisms are investigated to discover which one (s), if any, might be causing

Long term evolution of the Lageos Orbit

Since LAGEOS was launched in May 1976, precise laser observations of the satellite have been used to estimate relative station positions, polar motion and the earth's gravitational constant. This

Lunar tidal acceleration from Earth satellite orbit analyses

We present results for the M2 and O1 ocean tides based on the Starlette satellite orbit analyses from which the tidal acceleration of the moon is derived. The solution for M2 is consistent with

Atmospheric angular momentum fluctuations and changes in the length of the day

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Pleistocene deglaciation and the Earth's rotation: implications for mantle viscosity

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Pleistocene Glaciation and the Viscosity of the Lower Mantle

Summary The non-tidal acceleration of the Earth, revealed by astronomical observations and records of eclipses in antiquity, is attributed to the change in the Earth’s moment of inertia resulting