Decadal Oscillations of The Earth Rotation

Details Decadal Oscillations of The Earth Rotation Decadal Oscillations of The Earth Rotation

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1043..197c&link_type=abstract

EXPLORING THE SOLAR SYSTEM AND THE UNIVERSE. AIP Conference Proceedings, Volume 1043, pp. 197-200 (2008).

Astronomy and Astrophysics

Astronomy

1

Stellar Rotation, Celestial Mechanics, Astronomical Observations, Astronomical And Space-Research Instrumentation, Astrometry And Reference Systems, Interstellar Medium And Nebulae In External Galaxies, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

Scientific paper

The aim of the paper is to create a model of decadal variations of the universal time UT1 for the period 1623.5-2005.5. This model includes polynomial terms of power 2 and Fourier approximation of the periodical part using 100 harmonics, where some of them represent the intrinsic periods of natural phenomena: solar equatorial asymmetry-45a, solar magnetic cycle-22a, lunar node-18.6a and sunspot variations-11a. The coefficients of this model are determined by the Least Squares Method with amplitude estimation accuracy about 11 ms. A separation between the UT1 responses to the sunspots cycles and 12-year core signals is made.

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