GLOBAL GEOPOTENTIAL MODELS IN THE REGION OF HUNGARY

Abstract

The ability of some currently used high order geopotential models - OSU81, GPM2, IFE87E1 and 88E, OSU86E and 86F, OSU89A and OSU89B - to recover the gravity anomaly field in Hungary has been tested. There were three ways used to compare the geopotential coefficient solutions. One of the tests is based on using the point gravity data published by RENNER and SZILÁRD (1959). A comparison of quasigeoid undulations computed from the potential coefficients with undulations derived from Doppler stations positions has been performed. A detailed comparison of several geopotential solutions in terms of differences in gravity anomalies and quasigeoid undulations in the region of Hungary is also presented. The results have shown that OSU89B model is the most suitable one for use as a reference in the region of Hungary. This model is able to recover gravity anomalies over 54 % of the area of Hungary within 5 mgal and over 81 % of the country with 10 mgal. However, large systematic discrepancies have been observed between different geopotential solutions in the eastern part of Hungary as well as in the eastern and southern Neighbourhood of Hungary due to the lack of real surface gravity data from Romania, and from both the former countries of the Soviet Union and Yugoslavia, etc. in geopotential coefficients computations.