Earth and ocean tides from long-term analysis of satellite orbits

Precision laser tracking data on three close-earth satellites (Geos 1, Geos 2, and Lageos) are analyzed to obtain measurements of ocean tides, core-mantle resonance, and other mass displacements.Mean elements are computed for 6.0 years for Geos 1, 4.9 years for Geos 2, and 2.1 years for Lageos. Ocean tides T2, S2, K2, P1, K1, and φ1 are measured, along with the core-mantle resonance at the K1 and P1 frequencies, as predicted by Molodensky. Also measured are the Sa and Ssa tides and radiation-pressure area-to-mass ratios.