Determination and analysis of local seasonal terms of latitude variations

Details Determination and analysis of local seasonal terms of latitude variations Determination and analysis of local seasonal terms of latitude variations

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.177..139s&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 177, no. 1-2, March 1991, p. 139-143. Research supported by Polish Academy

Astronomy and Astrophysics

Astrophysics

Annual Variations, Earth Rotation, Geomagnetic Latitude, Stellar Motions, Astrometry, Least Squares Method, Maximum Entropy Method, Spectral Methods

Scientific paper

Local seasonal terms of latitude variations were determined on the basis of phi data of 17 BIH/IMPS stations and x, y, z data of the BIH global solution during the years 1967-1978. Some models for local corrections R to the latitude introduced by the BIH are created. The corrections R obtained from the least squares adjustment from one year data appear to be the best. The present study shows that it is necessary to determine these more frequently than once a year or to compute them for all stations simultaneously with the ERP. This will be particularly important in view of the future re-reduction of past astrometric data.

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