Corrections to gravity formula from direct observations and anomalies expressed in lower degree spherical harmonics
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Date
1962-04
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Publisher
Ohio State University. Division of Geodetic Science
Abstract
The author had at his disposal 11,586 1° x 1° mean free air anomalies and 8,172 1° x 1° mean isostatic anomalies, which were determined from surface gravity observations. Using the least-squares solution, he computed corrections to the International Gravity Formula, and he also computed the theoretical gravity formula for the triaxial ellipsoid. He determined the coefficients for lower degree spherical harmonics. These were computed two different ways: (1) using surface gravity anomalies alone, (2) combining surface gravity information and zonal harmonics computed from satellite data. Departures from the International Gravity Formula, and the contributions of the lower degree spherical harmonics to the undulation of the geoid are given in map form. All computations are referred to the Potsdam System, g = 981.27400 gal.
Description
Prepared for Geophysics Research Directorate, Air Force Cambridge Research Laboratories, Office of Aerospace Research, United States Air Force, Bedford, Massachusetts: Contract No. AF 19(604)-6201, Project No. 7600, Task No. 76002 (OSURF Project 1058)