Time stability of spring and superconducting gravimeters through the analysis of very long gravity records |
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| Institution: | 1. Institut de Physique du Globe de Strasbourg, IPGS – UMR 7516, CNRS/Université de Strasbourg (EOST), 5 rue René Descartes, 67084 Strasbourg Cedex, France;2. Observatorio Geofísico Central, Instituto Geográfico Nacional (IGN), c/ Alfonso XII 3, 28014 Madrid, Spain;3. Georges Lemaître Centre for Earth and Climate Research, Catholic University of Louvain, Louvain-la-Neuve, Belgium;4. Black Forest Observatory, Schiltach, Germany;1. Geodetic Observatory Pecný, Research Institute of Geodesy, Topography and Cartography, Ond?ejov 244, 25165, Czech Republic;2. Institut für Astronomische und Physikalische Geodäsie, Technische Universität München, Arcisstraße 21, 80333 München, Germany;1. Department of Astronomy, Faculty of Mathematics, University of Belgrade, Studentski trg 16, 11000 Belgrade, Serbia;2. Astronomical Observatory, Volgina 7, 11060 Belgrade 38, Serbia;3. Special Astrophysical Observatory of the Russian AS, Nizhnij Arkhyz, Karachaevo-Cherkesia 369167, Russia;4. Instituto Nacional de Astrofísica, Óptica y Electrónica, Apartado Postal 51y 216, 72000 Puebla, Mexico;1. Laboratoire de Physique Atmosphérique et Planétaire, Université de Liège, Liège, Belgium;2. IAPS-INAF, Rome, Italy;3. Observatoire de Paris – Meudon, LESIA, Meudon, France;1. School of Geodesy and Geomatics/Key Laboratory of the Geospace Environment and Geodesy, Wuhan University, Wuhan 430079, China;2. State Key Laboratory for Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China |
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| Abstract: | Long gravity records are of great interest when performing tidal analyses. Indeed, long series enable to separate contributions of near-frequency waves and also to detect low frequency signals (e.g. long period tides and polar motion). In addition to the length of the series, the quality of the data and the temporal stability of the noise are also very important. We study in detail some of the longest gravity records available in Europe: 3 data sets recorded with spring gravimeters in Black Forest Observatory (Germany, 1980–2012), Walferdange (Luxemburg, 1980–1995) and Potsdam (Germany, 1974–1998) and several superconducting gravimeters (SGs) data sets, with at least 9 years of continuous records, at different European GGP (Global Geodynamics Project) sites (Bad Homburg, Brussels, Medicina, Membach, Moxa, Vienna, Wettzell and Strasbourg). The stability of each instrument is investigated using the temporal variations of tidal parameters (amplitude factor and phase difference) for the main tidal waves (O1, K1, M2 and S2) as well as the M2/O1 factor ratio, the later being insensitive to the instrumental calibration. The long term stability of the tidal observations is also dependent on the stability of the scale factor of the relative gravimeters. Therefore we also check the time stability of the scale factor for the superconducting gravimeter C026 installed at the J9 Gravimetric Observatory of Strasbourg (France), using numerous calibration experiments carried out by co-located absolute gravimeter (AG) measurements during the last 15 years. The reproducibility of the scale factor and the achievable precision are investigated by comparing the results of different calibration campaigns. Finally we present a spectrum of the 25 years of SG records at J9 Observatory, with special attention to small amplitude tides in the semi-diurnal and diurnal bands, as well as to the low frequency part. |
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| Keywords: | Spring gravimeter Superconducting gravimeter Instrumental sensitivity Instrumental calibration Earth tides Time stability |
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