Theories of the Earth’s nutation show that the couplings between the core andmantle can give rise to an additional rotational normal mode,except for the Chandlerwobble(CW),due to the ellipsoidal core-mantle boundary ...Theories of the Earth’s nutation show that the couplings between the core andmantle can give rise to an additional rotational normal mode,except for the Chandlerwobble(CW),due to the ellipsoidal core-mantle boundary and the fluid core of the Earth.The normal mode has often been referred to as the nearly diurnal free wobble(NDFW)with a period of nearly one sidereal day as viewed from the terrestrial reference system.The nutation of this mode relative to inertial reference system is retrograde free corenutation(RFCN).The theoretical value of the period is about 460 sidereal days.展开更多
Establishment of the Russian section in the framework of Global Geodetic Observing System （GGOS） is under progress. New components of ＂Quasar＂ network observatories, which are included into GGOS global network as ...Establishment of the Russian section in the framework of Global Geodetic Observing System （GGOS） is under progress. New components of ＂Quasar＂ network observatories, which are included into GGOS global network as core stations, are presented. Recent developments include： two new generation radio telescopes with 13 m antennas at Badary and Zelenchukskaya observatories, water vapor radiometers installed at all observatories and software correlator at the Institute of Applied Astronomy. New and potential developments within other networks belonging to different agencies are also considered in the context of widening of Russian section activity in GGOS project, The paper gives a short overview of status, new components and plans, concerning 5 sub-networks of Federal Agency of Scientific Organi- zations, Roskosmos, Rosstandard, and Rosreestr. Short overview of the plans on creating Data and Analysis Distributed Center is also ~iven.展开更多
基金Project supported by the National Natural Science Foundation of China.
文摘Theories of the Earth’s nutation show that the couplings between the core andmantle can give rise to an additional rotational normal mode,except for the Chandlerwobble(CW),due to the ellipsoidal core-mantle boundary and the fluid core of the Earth.The normal mode has often been referred to as the nearly diurnal free wobble(NDFW)with a period of nearly one sidereal day as viewed from the terrestrial reference system.The nutation of this mode relative to inertial reference system is retrograde free corenutation(RFCN).The theoretical value of the period is about 460 sidereal days.
文摘Establishment of the Russian section in the framework of Global Geodetic Observing System （GGOS） is under progress. New components of ＂Quasar＂ network observatories, which are included into GGOS global network as core stations, are presented. Recent developments include： two new generation radio telescopes with 13 m antennas at Badary and Zelenchukskaya observatories, water vapor radiometers installed at all observatories and software correlator at the Institute of Applied Astronomy. New and potential developments within other networks belonging to different agencies are also considered in the context of widening of Russian section activity in GGOS project, The paper gives a short overview of status, new components and plans, concerning 5 sub-networks of Federal Agency of Scientific Organi- zations, Roskosmos, Rosstandard, and Rosreestr. Short overview of the plans on creating Data and Analysis Distributed Center is also ~iven.
