Earth´s dimension specified by geoidal geopotential.

Autor: Burša, Milan, 1929-2019
Další autoři:
Vatrt, Viliam, 1953-
Jazyk: angličtina
Předmět:
Druh dokumentu: Non-fiction
ISSN: 0039-3169
Abstrakt: Abstract: a1_The TOPEX/POSEIDON (T/P) satellite altimeter data from January 1, 1993 to January 3, 2001 (cycles 11-305) was used for investigating the long-term variations of the geoidal geopotential W0 and the geopotential scale factor R0 = GM÷W0 (GM is the adopted geocentric gravitational constant). The mean values over the whole period covered are W0 = (62 636 856.161 +- 0.002) m2s-2, R0 = (6 363 672.5448 +- 0.0002) m. The actual accuracy is limited by the altimeter calibration error (2-3 cm) and it is conservatively estimated to be about +- 0.5 m2s-2 (+- 5 cm). The differences between the yearly mean sea surface (MSS) levels came out as follows: 1993-1994: -(1.2 +- 0.7) mm, 1994-1995: (0.5 +- 0.7) mm, 1995-1996: (0.5 +- 0.7) mm, 1996-1997: (0.1 +- 0.7) mm, 1997-1998: -(0.5 +- 0.7) mm, 1998-1999: (0.0 +- 0.7) mm and 1999-2000: (0.6 +- 0.7) mm. The corresponding rate of change in the MSS level (or R0) during the whole period of 1993-2000 is (0.02 +- 0.07) mm/y. The value W0 was found to be quite stable, it depends only on the adopted GM, ? and the volume enclosed by surface W = W0. W0 can also uniquely define the reference (geoidal) surface that is required for a number of applications, including World Height System and General Relativity in precise time keeping and time definitions, that is why W0 is considered to be suitable for adoption as a primary astrogeodetic parameter.
Databáze: Katalog Knihovny AV ČR
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