Abstract Recent progress on monitoring variations in the first and second degree gravitational harmonics of the Earth using satellite laser ranging is presented. The problem of interpreting the observed signals in terms of geophysical excitations is discussed, particularly for the second degree zonal variations. The difficulty in separating changes due to postglacial rebound from those due to the 18.6 year tide is demonstrated, as is the sensitivity in the results to long period variability in the atmosphere or cryosphere. The kinematic interpretation of the first degree variations as changes in the position of the solid Earth with respect to the center of mass or geocenter is developed, and time series of such variations over the period 1987-present are presented.


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    Titel :

    Long term changes in the Earth's shape, rotation, and geocenter


    Beteiligte:

    Erschienen in:

    Advances in Space Research ; 13 , 11 ; 251-255


    Erscheinungsdatum :

    01.01.1993


    Format / Umfang :

    5 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




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