共查询到20条相似文献，搜索用时 718 毫秒
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Geophysical analysis of zonal tidal signals in length of day 总被引：5，自引：0，他引：5
Benjamin Fong Chao James B. Merriam Yoshiaki Tamura 《Geophysical Journal International》1995,122(3):765-775
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Sergey M. Molodensky 《Geophysical Journal International》1989,97(3):459-469
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Daily geomagnetic variations on the Iberian Peninsula 总被引：2，自引：0，他引：2
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An ephemeris for gravity tide predictions at the nanogal level 总被引：3，自引：0，他引：3
J. B. Merriam 《Geophysical Journal International》1992,108(2):415-422
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The results are presented from tidal gravity measurements at five sites in Europe using LaCoste and Romberg ET gravimeters. Improvements that we have made to the accuracies of these gravimeters are discussed. It is shown that the 'standard' calibration of the International Center for Earth Tides, used for worldwide tidal gravity profiles, is 1.2 per cent too high. The M2 and O1 observations are compared with model calculations of the Earth's body tide and ocean tide loading and it is shown that there is a very significant improvement in the agreement between observations and models compared to that obtained with previous tidal gravity measurements. For O1 , where the ocean tide loading and attraction in central Europe is only 0.4 per cent of the body tide, our measurements verify that the Dehant-Wahr anelastic body tide model gravimetric factor is accurate to 0.2 per cent. It is also shown that the effects of lateral heterogeneities in Earth structure on tidal gravity are too small to explain the large anomalies in previously published tidal gravity amplitudes. The observations clearly show the importance of conserving tidal mass in the Schwiderski ocean tide model. For sites in central Europe, the M2 and O1 observations and the models are in agreement at the 0.1 μgal (10−9 m s−2 ) level and tidal corrections to this accuracy can now be made to absolute gravity measurements. 相似文献
The results are presented from tidal gravity measurements at five sites in Europe using LaCoste and Romberg ET gravimeters. Improvements that we have made to the accuracies of these gravimeters are discussed. It is shown that the 'standard' calibration of the International Center for Earth Tides, used for worldwide tidal gravity profiles, is 1.2 per cent too high. The M
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C. Sozou 《Geophysical Journal International》1997,130(1):151-156
Laplace's tidal equations for the case of an ocean of constant depth bounded by meridians were considered by two authors at a specific frequency as an eigenvalue problem in the azimuthal wavenumber. A finite spectrum of eigenwavenumbers was found. That eigenvalue problem is re-examined by means of asymptotic techniques and numerical integration of the governing equation of the problem. At low frequencies a formula connecting the frequency and the number of eigensolutions is established. It is shown that at a given frequency the spectrum of eigenwavenumbers is wider than that reported, but (for this type of solution) the meridional boundary conditions are satisfied approximately only for the case of very low frequencies. 相似文献
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Lunar daily geomagnetic variations in New Zealand 总被引：1，自引：0，他引：1
J. D. McKnight 《Geophysical Journal International》1995,122(3):889-898