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  • 1
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    Temporal variations of the earth's gravitational field from satellite laser ranging to LAGEOS (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Monthly values of the J2 and J3 earth gravitational coefficients were estimated using LAGEOS satellite laser ranging data collected between 1980 and 1989. Monthly variations in gravitational coefficients caused by atmospheric mass redistribution were calculated using measurements of variations in surface atmospheric pressure. Results for correlation studies of the two time series are presented. The LAGEOS and atmospheric J2 time series agree well and it appears that variations in J2 can be attributed to the redistribution of atmospheric mass. Atmospheric and LAGEOS estimates for J3 show poorer agreement, J3 estimates appear to be very sensitive to unmodeled forces acting on the satellite. Results indicate that the LAGEOS data can be used to detect small variations in the gravitational field.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 20; 7; p. 595-598.
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  • 2
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    Excitation of earth's polar motion by atmospheric angular momentum variations, 1980-1990 (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: We compute the polar-motion excitation function due to the atmospheric angular momentum (AAM) for both IB (inverted-barometer) and non-IB cases, as well as the excitation function from geodetically observed Earth orientation data for the period 1980-1990. The two are then compared in studying the AAM contribution to the polar motion excitation. The polar drifts with periods longer than about two years have similar characteristics, but the comparison is inconclusive because of data uncertainties. For the seasonal wobble excitation, the agreement is poor except for the prograde annual wobble, indicating the influence of other geophysical excitations than AAM. For the Chandler wobble excitation, a correlation coefficient of 0.53 for non-IB and 0.58 for IB are found for 1986-1990. Together with a coherence spectral analysis, they clearly demonstrate a strong contribution of AAM to the Chandler wobble excitation.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 20; 3; p. 253-256.
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  • 3
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    A cursory examination of the sensitivity of the tropospheric range and Doppler effects to the shape of the refractivity profile (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Ray tracing techniques for examination of refractivity profile sensitivity in tropospheric range and Doppler effects on profile shape
    Keywords: GEOPHYSICS
    Type: THE DEEP SPACE NETWORK, VOL. 1 15 FEB. 1971; P 22-30
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  • 4
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    Nickel-iron spherules from the Aouelloul glass of Mauritania, Africa (1966)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Microstructure of nickel-iron spherules from Aouelloul glass
    Keywords: GEOPHYSICS
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  • 5
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    Impact metamorphism (1966)
    In:  CASI
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    Publication Date: 2006-10-26
    Description: Diagnostic petrographic criteria for establishing progressive stages of hypervelocity meteorite impact
    Keywords: GEOPHYSICS
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  • 6
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    Comment on 'A new method of spectral analysis and its application to the earth's free oscillations - The 'Sompi' method' by S. Hori et al (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 95; 19789
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  • 7
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    The earth's equatorial principal axes and moments of inertia (1991)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The earth's equatorial principal moments of inertia are given as A and B, where A is less than B, and the corresponding principal axes are given as a and b. Explicit formulas are derived for determining the orientation of a and b axes and the difference B - A using C(22) and S(22), the two gravitational harmonic coefficients of degree 2 and order 2. For the earth, the a axis lies along the (14.93 deg W, 165.07 deg E) diameter, and the b axis lies perpendicular to it along the (75.07 deg E, 104.93 deg W) diameter. The difference B - A is 7.260 x 10 to the -6th MR2. These quantities for other planets are contrasted, and geophysical implications are discussed.
    Keywords: GEOPHYSICS
    Type: Geophysical Journal International (ISSN 0955-419X); 106; 699-702
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  • 8
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    Effect of a uniform sea-level change on the earth's rotation and gravitational field (1988)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Global water redistriburtion between the oceans, atmosphere and continents causes changes in the earth's rotation and gravitational field. To conserve water mass, the effect of the small uniform change in sea-level must be considered. Explicit formulas are provided for these sea-level corrections to the gravitational Stokes coefficients, polar motion and length of day. In two recent publications, this sea-level correction term for polar motion was given incorrectly. These errors which arose from normalization conventions with the ocean function are corrected.
    Keywords: GEOPHYSICS
    Type: Geophysical Journal (ISSN 0952-4592); 93; 191-193
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  • 9
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    Snow load effect on earth's rotation and gravitational field, 1979-1985 (1987)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A global, monthly snow depth data set has been generated from the Nimbus 7 satellite observations using passive microwave remote-sensing techniques. Seven years of data, 1979-1985, are analyzed to compute the snow load effects on the earth's rotation and low-degree zonal gravitational field. The resultant time series show dominant seasonal cycles. The annual peak-to-peak variation in J2 is found to be 2.3 x 10 to the -10th, that in J3 to be 1.1 x 10 to the -10th, and believed to decrease rapidly for higher degrees. The corresponding change in the length of day is 41 micro-s. The annual wobble excitation is (4.9 marc sec, -109 deg) for the prograde motion component and (4.8 marc sec, -28 deg) for the retrograde motion component. The excitation power of the Chandler wobble due to the snow load is estimated to be about 25 dB less than the power needed to maintain the observed Chandler wobble.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 92; 9415-942
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  • 10
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    Application of internal gravitational field equations to geophysical measurement of G (1989)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The spherical harmonic equation for the gravitational potential inside the earth is presented. The equation satisfies Poisson's equation and converges uniformly. It obviates the need for downward continuation of the exterior potential with its attendant convergence difficulties but of course requires some knowledge of the earth's density distribution. The equation is used to derive the general expression for the geophysical measurement of the gravitational constant G made inside the earth, such as in boreholes and mine shafts. Numerical evidence is also presented to show that the long- to intermediate-wavelength gravity anomalies can masquerade as the 'fifth force' if not properly corrected for.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 94; 7563-756
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