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Polar motion and Earth rotation
Author(s) -
Tapley Byron D.
Publication year - 1983
Publication title -
reviews of geophysics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 8.087
H-Index - 156
eISSN - 1944-9208
pISSN - 8755-1209
DOI - 10.1029/rg021i003p00569
Subject(s) - polar motion , earth's rotation , very long baseline interferometry , geodesy , polar , rotation (mathematics) , geology , motion (physics) , doppler effect , physics , geophysics , rotation period , interferometry , satellite , optics , astronomy , geometry , mathematics , classical mechanics , stars
During the period from 1979 through 1982, polar motion and earth rotation activity centered on the development of new observation techniques and the investigations of the relation between the observed motions and geophysical phenomena. Determinations of polar motion through classical techniques continued, but the number of United States observing sites was reduced. However, significant advances in alternate methods for polar motion and earth rotation determination were achieved. Regular polar motion and length of day determinations are being reported now by groups analyzing satellite doppler, laser ranging and very long baseline interferometry (VLBI) data, and preliminary determinations of UT1 by these methods are now being reported.