ABSOLUTE GRAVITY MEASUREMENTS AT SYOWA STATION : RESULTS BY THE ABSOLUTE GRAVIMETER WITH A ROTATING VACUUM PIPE

• Main Authors: ハナダ ヒデオ, ツボカワ ツネヤ, Hideo HANADA, Tsuneya TSUBOKAWA
• Format: Report
• Language: English
• Published: Mizusawa Astrogeodynamics Observatory, National Astronomical Observatory 1994
• Subjects: Syowa Station; Antarc*; Antarctica
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2748; http://id.nii.ac.jp/1291/00002748/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2748&item_no=1&attribute_id=18&file_no=1

We measured absolute gravity values at Syowa Station, Antarctica, which is one of the subsets A of the International Absolute Gravity Basestation Network (IAGBN), from December 28,1992 to February 5,1993 by employing an absolute gravimeter with a rotating vacuum pipe (AGRVP) together with a transportable absolute gravimeter (No. 2) of the National Astronomical Observatory, Mizusawa (NAOM#2). The results of the AGRVP gave two solutions which differ by about 2.3×10^<-6> ms^<-2> (230μGals). According to comparisons with results by other absolute gravimeters at Syowa Station, Esashi Gravity Station of National Astronomical Observatory and Gravity Station of Geographical Survey Institute, the solution with a lower value seems to be reasonable. An arithmetic mean of 43 gravity measurements was 9.82524113±0.6×10^<-7> ms^<-2> with a standard deviation of 4.0×10^<-7> ms^<-2>. This value is about 4.0×10^<-7> ms^<-2> lower than that obtained by the absolute gravimeter NAOM#2,which was set on the same pier for almost the same period, and is about 1.4×10^<-6> ms^<-2> lower than that obtained by an absolute gravimeter of Sakuma-type, which was set on the same pier almost one year before. One possible cause for the difference between the two solutions is the misalignment of the falling object.