HR: 1330h
AN: G32A-0735    [PDF]
TI: Gravity Effects of Solar Eclipse and Inducted Gravitational Field
AU: * Tang, K
EM: kytang@mail.igcas.ac.cn
AF: Institute of Geology and Geophysics, Chinese Academy of Sciences, No.1, North Tucheng Xi Road Chaoyang District, Beijing, 100029 China
AU: * Tang, K
EM: kytang@mail.igcas.ac.cn
AF: National Astronomy Observatory, 20A, Datun Road Chaoyang District, Beijing, 100012 China
AU: Wang, Q
EM:
AF: Institute of Geology and Geophysics, Chinese Academy of Sciences, No.1, North Tucheng Xi Road Chaoyang District, Beijing, 100029 China
AU: Zhang, H
EM:
AF: National Astronomy Observatory, 20A, Datun Road Chaoyang District, Beijing, 100012 China
AU: Hua, C
EM:
AF: Institute of Geophysics,China Seismological Bureau, No.5, Min Yuan South Road Haidian District, Beijing, 100086 China
AU: Peng, F
EM:
AF: Institute of Geology and Geophysics, Chinese Academy of Sciences, No.1, North Tucheng Xi Road Chaoyang District, Beijing, 100029 China
AU: Hu, K
EM:
AF: National Astronomy Observatory, 20A, Datun Road Chaoyang District, Beijing, 100012 China
AB: During solar eclipses in recent decades, gravity anomalies were observed and difficult to be explained by Newton's gravitational theory. During the solar eclipse of 1995, India scientists Mishra et al. recorded a gravity valley in amplitude of 12 $\mu$Gal; they interpreted that qualitatively as atmospheric effects. During the total solar eclipse of March 1997, we conducted a comprehensive geophysical observation at Mohe geophysical observatory of China (with latitude of $53.49^0 N$ and longitude of $122.34^0 E$. From the data we recorded, we found two valleys about 5 to 7 $\mu$Gal. Unnikrishnan et al. inferred this gravity anomaly was caused by the environment changes. We know that the observation had been conducting in a room inside a small building with a stable coal heating system; the temperature variation inside the experimental room was less $1^0C$ during the eclipse. Moreover, the measured atmospheric pressure change was less 1hPa during the eclipse. It is reasonable to believe that surrounding environment of the observatory excluded the significant gravity variations caused by temperature, pressure variation and local moving of persons and vehicles. To further study the gravity effects related to solar eclipses, our scientific team took more observations during Zambia total solar eclipse of June 2001 and Australia total solar eclipse of December 2002. After data corrections, we found respectively two gravity anomalies, with 3 to 4$\mu$Gal for Zambia eclipse and 1.5$\mu$Gal for Australia eclipse. As many scientists have pointed out that pressure-gravity factor is lower than 0.3$\mu$Gal/hPa, it means that any gravity anomaly great than $0.5\mu$Gal could not be inferred as the results of atmospheric pressure change. The two more gravity anomalies recorded during the solar eclipses provided us strong evidences that some gravity anomalies could not simply be inferred as atmospheric pressure change. We have tried to explain those anomalies by the induced gravitational field.
DE: 1200 GEODESY AND GRAVITY
SC: Geodesy [G]
MN: 2003 Fall Meeting