Variations Of The Second Order Harmonics Of Geopotential From The Analysis Of The Lageos And Etalon SLR Data For 1988-2003

Details Variations Of The Second Order Harmonics Of Geopotential From The Analysis Of The Lageos And Etalon SLR Data For 1988-2003 Variations Of The Second Order Harmonics Of Geopotential From The Analysis Of The Lageos And Etalon SLR Data For 1988-2003

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..16e..73i&link_type=abstract

Nomenclature, Precession and New Models in Fundamental Astronomy, 26th meeting of the IAU, Joint Discussion 16, 22-23 August 200

Astronomy and Astrophysics

Astronomy

Scientific paper

The paper is devoted to study of the second order harmonics of the geopotential from the analysis of laser ranging to Lageos 1&2 and Etalon 1&2 satellites. All available observations for Lageos (1988-2003, about 2000000) and Etalon (1992-2001, about 100000) are taken from the Crustal Dynamics Data Informational System (CDDIS) and the European Data Center (EDC). The main aim is to estimate the K[1] tidal wave in the tesseral harmonics C[21] and S[21] which manifest themselves as sinusoidal oscillations ΔC[21] and ΔS[21 ]with the period of one sidereal day given in the IERS Conventions 2000 for the normalized coefficients C[21] and S[21] in the form (ΔC[21]) [K1] = K[1] sin (θ[g]+ π), (ΔS[21]) [K1] = K[1] cos (θ[g] + π), where K[1] = 471.8 10 ^-12 and θ[g] is the Greenwich Mean Sidereal Time. This wave is caused by the differential rotation of the Earth's fluid core and so is very informative for geophysics. In this work K[1] amplitude as well as the correction to C[20] have been estimated from the analysis of the data mentioned above: K[1] = (414.3 ± 23.0) 10 ^-12, C[20] = (-19.0 ± 20.6) 10 ^-12.

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