Open AccessAn analysis of the homogeneous ILS polar motion series
Author(s) -
Wilson Clark R.,
Vicente R. O.
Publication year - 1980
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1980.tb02594.x
Subject(s) - polar motion , geodesy , homogeneous , motion (physics) , series (stratigraphy) , oscillation (cell signaling) , geology , position (finance) , earth's rotation , latitude , polar , meteorology , mathematics , climatology , geography , physics , statistical physics , classical mechanics , economics , astronomy , paleontology , finance , biology , genetics
Summary A new reduction of the International Latitude Service Observations for the years 1899–1977 has recently been completed under the direction of Dr S. Yumi and the International Astronomical Union Commission 19. This paper examines the annual, Chandler frequency, and long period motion of the Earth's pole implied by this new homogeneous data set. The estimated annual polar motion differs slightly from earlier results. The new value for the Chandler frequency is also very close to earlier results, but the estimated Q is somewhat larger, as might be expected by a reduction in noise level. Analysis of the long period motion shows an apparent drift and, in agreement with earlier studies using other data, there is some evidence of an approximately 30‐yr oscillation in the pole position.