Abstract

A refined gravity field model, Goddard Earth Model GEM-12, has been derived using the Lageos obrital data yielding better baseline measurements for the analysis of tectonic plate motion. This field also contributes to an improved understanding of long wavelength features, such as the sea slope across broad ocean basins, through its significant improvement of the long wavelength geoid.

Abstract

This investigation studies the possibility of improving the accuracy of geodetic results by use of simultaneous observed ranges to Lageos, ina differencing mode, from pairs of stations.

Abstract

Page 37 of the 25th Anniversary Report of MSFC discusses the Lageos program and how it fit into the MSFC program assignments.

Abstract

This is a notebook containing copies of collected references on the secular decrease of the semimajor axis of the orbit of Lageos. The first reference is by D.P. Rubincam (1982). The last is by Alfonso et al (1985).

Abstract

A second Laser Geodynamic Satellite, LAGEOS 2, is being developed in Italy under a joint agreement between the Italian and Ameican space agencies. The AERITALIA SPACE SYSTEMS GROUP is the prime contractor for LAGEOS 2 which is similar LAGEOS 1 launched by NASA in 1976 for space geodesy.

Abstract We computed zonal geopotimal coefficients from average seasonal variations in global air and water mass distributions. These coefficients are used to predict the seasonal variations of LAGEOS' and Starlette's orbital node, delta Omega, and the seasonal delta J3 for Starlette. A comparison of these predictions with the observed values indicates that air pressure and, to a lesser extent, water storage may be responsible for a large portion of the currently unmodeled variation in the earth's...

Abstract

NASA Research Announcement soliciting proposals for basic research in the use of ground-based satellite laser ranging to Lageos II for the period ending August 1, 1988.

Abstract The dragging of inertial frames is a consequence of Einstein's General Relativity. ...The dragging of the orbital plane (and the orbital angular momentum) of a test particle orbiting the field of a rotating body is included among the various effects due to the gravitomagnetic field. This spaper proposes a new Lageos-type satellite (Lageos 3) which is physically identical to Lageos-1 and is placed in an orbit with identical altitude and eccentricity and with an inclination supplementary to...

Abstract

Seven years (1984 through 1990) of Laser data on Lageos have been analysed to recover absolute station velocities and J2. Relative motions between stations located in stable tectonic regions agree well with the NUVEL-1 model predictions within 5mm/yr rms.

Abstract

On October 23, 1992 NASA deployed the Italian Space Agency (ASI)-constructed Italian Research Interim Stage (IRIS) booster holding the LAGEOS II satellite from the shuttle Columbia. IRIS took LAGEOS II from shuttle altitude to its nominal orbital altitude 5,900 km, where a second small booster put Lageos II into a circular orbit.