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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Results of the VLBI experiments conducted with Syowa Station, Antarctica
Journal of Geodesy, Volume 79, No. 6-7, Year 2005
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Description
The first successful geodetic Very Long Baseline Interferometry (VLBI) observations to Antarctica were made on baselines from Syowa Station (Antarctica) to Tidbinbilla (Australia) and to Kashima (Japan) in January 1990. Regular geodetic experiments started in 1998 with the installation of a permanent VLBI terminal at Syowa Station. These observations are conducted at the standard geodetic VLBI frequencies of 2.3 and 8.4 GHz, S- and X-Bands. In the first year, the 11-m multipurpose antenna at Syowa Station observed together with the 26-m radio telescope of the University of Tasmania in Australia and the 26-m radio telescope of the Hartebeesthoek Radio Astronomy Observatory in South Africa. From 1999, the experiments were expanded to also include the O'Higgins Station in Antarctica, Fortaleza in Brazil and Kokee on Hawaii. From 1999 until the end of 2003, 25 observing sessions have been reduced and analyzed using the CALC/SOLVE geodetic VLBI data reduction package. The results show that the horizontal baseline of Syowa-Hobart is increasing at the rate of 57.0±1.9 mm/year. The baseline Syowa-Hartebeesthoek is also increasing, but at the lower rate of 9.8±1.9 mm/year. The VLBI result of 2.0±3.1 mm/year and the GPS result of -1.9±0.7 mm/year for the Syowa-O'Higgins horizontal baseline support the hypothesis of one rigid Antarctic plate without intra-plate deformation, which is consistent with the NNR-NUVEL-1A global plate motion model. The location of the Euler pole of the Antarctic plate by VLBI is estimated as 59.7°S and 62.6°E with a rotation rate of 0.190 deg/Myr, while that by GPS in our study is estimated as 60.6°S and 42.2°E with a rotation rate of 0.221 deg/Myr. These pole positions are slightly different to that implied by the NNR-NUVEL-1A model of 63.0°S and 64.2°E with a rotation rate of 0.238 deg/Myr. VLBI observations over a longer time span may resolve small discrepancy of current plate motion from the NNR-NUVEL-1A model. The consistency of the VLBI coordinates with the GPS coordinates at Syowa Station, after correction for the local tie vector components between the two reference markers, is also discussed. © Springer-Verlag Berlin Heidelberg 2005.
Authors & Co-Authors
Fukuzaki, Y.
Japan, Tsukuba
Geospatial Information Authority of Japan
Shibuya, K.
Japan, Tokyo
National Institute of Polar Research
Doi, K.
Japan, Tokyo
National Institute of Polar Research
Ozawa, T.
Japan, Tsukuba
National Research Institute for Earth Science and Disaster Resilience
Nothnagel, Axel
Germany, Bonn
Universität Bonn
Jike, Takaaki
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Iwano, S.
Japan, Kyoto
Kyoto University
Jauncey, David L.
Australia, Sydney
Australia Telescope National Facility
Nicolson, George D.
South Africa, Krugersdorp
Hartebeesthoek Radio Astronomy Observatory
McCulloch, Peter M.
Australia, Hobart
University of Tasmania
Statistics
Citations: 12
Authors: 10
Affiliations: 9
Identifiers
Doi:
10.1007/s00190-005-0476-8
ISSN:
09497714
Study Locations
South Africa