Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1043..218c&link_type=abstract
EXPLORING THE SOLAR SYSTEM AND THE UNIVERSE. AIP Conference Proceedings, Volume 1043, pp. 218-219 (2008).
Astronomy and Astrophysics
Astronomy
El Nino Southern Oscillation, Stellar Rotation, Celestial Mechanics, Astrometry And Reference Systems, Astronomical Observations
Scientific paper
Atmospheric Angular Momentum (AAM) and Ocean Angular Momentum (OAM) function excite Length of Day (LOD) variations and affect Universal Time (UT1) variations at wide frequency band also, which appear as parasitical noise in some problems of parameters estimation. The influences of AAM and OAM on UT1 are determined by an integrating of the AAM and OAM excitation functions of LOD, after removing of their constant parts. The resulting series still contain significant linear trends for some intervals, due to relatively small systematic deviations from the total mean value of LOD excitation (less than 80 μs). The final UT1 corrections for AAM and OAM influences are determined by removing of the residual trends. The maximal AAM effect on UT1 variations is about 100 ms and 1-2ms for OAM series. The obtained time series have good consistency and their application yield more precise estimation of the periodical terms of the Earth rotation.
Chapanov Yavor
Gambis Daniel
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