313 research outputs found

    National Geodetic Satellite Program, Part II: University of California, Los Angeles

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    Satellite orbit analyses are presented which were undertaken for: (1) reasons of insight and economy; (2) obtaining geophysically interesting tesseral harmonics; (3) comparing effects of tracking station location error drag, radiation pressure, and luni-solar attraction to tesseral harmonic effects; and (4) combination of satellite and terrestrial data. The analyses were divided into the following phases: (1) MINITRACK interferometry; early Baker-Nunn camera directions; (2) late Baker-Nunn camera directions; and (3) combined Baker-Nunn camera and TRANET Doppler data

    Analysis of Geodetic Satellite Tracking Data to Determine Tesseral Harmonics of the Earth's Gravitational Field Final Report

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    Photographic and Doppler tracking of geodetic satellites to determine tesseral harmonics of earth gravitational field

    Lunar orbiter selenodesy studies Quarterly reports, 1 Jan. - 30 Jun. 1969

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    Lunar gravitation and mass concentration observed by lunar orbite

    Elastic models of the mantle corresponding to variations in the external gravity field

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    Elastic models of earth mantle corresponding to variations in external gravity fiel

    Tidal theory and orbital perturbations Semiannual report, 1 Dec. 1968 - 31 May 1969

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    Tidal theory and orbital perturbation

    Variations of the earth's gravitational field from camera tracking of satellites

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    Simultaneous determinations of tesseral harmonic coefficients of gravitational field, ground station coordinates, and orbital elements by satellite photographic trackin

    Geodynamic problems

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    The understanding of the solid earth and suggestions of what measurements should be undertaken based on estimates of instrumental feasibilities were reviewed. The observations include: (1) earth evolution and mantle convection; (2) lithosphere-asthenosphere-surface load interaction; (3) glacier-ocean-solid earth interaction; (4) solid earth interactions with the sun, moon, core, oceans, and atmosphere; (5) zones of strain accumulation; and (6) earthquakes

    Tests of satellite determinations of the gravity field against gravimetry and their combination

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    Gravity field determinations from satellite orbit perturbations tested against gravimetric standard

    Mechanical processess affecting differentiation of protolunar material

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    Mechanisms prior to lunar formation are sought to account for the loss of volatiles, the depletion of iron, and the enrichment of plagioclase. Some of the same mechanisms are necessary to account for achondritic, stony-iron, and iron meteorites. Collisions seem marginally capable of providing the heat to accomplish the differentiation into iron, magnesian silicates, and plagioclase. Once this differentiation is accomplished, the subsequent mechanical history should have been sufficient to sort material according to composition in the protolunar circumterrestrial cloud. Effects operating include the correlation of body size with mechanical strength; the lesser ability of the cloud to trap the larger, denser infalling bodies; the more rapid drawing into the Earth of the larger moonlets; and the higher energy orbits for dominantly plagioclase smaller pieces broken off by collision

    Tidal theory and orbital perturbations

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    Linking ocean tides to satellite orbit
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