A Three Year Comparison Between a Superconducting Gravimeter(GWR C026) and an Absolute Gravimeter(FG5#206) in Strasbourg(France).

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Two instruments operate in parallel since beginning 1997 in Strasbourg, France: a superconducting gravimeter (SG) (GWR C026) and an absolute gravimeter (AG) (Micro-g Sol. FG5- 206). A first objective of this study is to check the stability in time over three years of the calibration factor which is directly obtained from least squares fitting the SG data to the absolute raw gravity measurements. Another important objective is to evaluate the capability of both types of instruments to retrieve long term changes in the Earth's gravity; in particular, we will focus on the signature of the polar motion and compare it to the theoretical prediction. Subsequently we will investigate the stability (or lack of stability) in gravity after correcting the previous s Fax : (33) 3 88 41 64 77; Email:mamalvict@eost.u-strasbg.fr ignals for the polar motion effect.
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