************************************************************************ IERS Message No. 78 November 28, 2005 ************************************************************************ Weekly update of geodetic/atmospheric excitations for polar motion and length of day Two years ago the IERS Earth Orientation Center has set up interactive WEB tools (http://hpiers.obspm.fr/eop-pc). Two of them are devoted to the atmospheric excitation of Earth rotation: polar motion and length of day for the "long term" Atmospheric Angular Momentum (AAM) component of the equatorial AAM (series NCEP provided by the IERS Global Geophysical Fluid Center). These tools have been improved recently. In particular it is now possible to COMPARE the LAST excitation found in Polar Motion (PM) and Excess of Lenghth of Day (LOD) (series EOP C04 values up dated two times per week) with the LAST AAM variations (updated daily by the National Meteorological Center, USA). It can bring worthful information, especially for tracking episodic phenomena. See: http://hpiers.obspm.fr/eop-pc/analysis/excitactive.html (PM & LOD) http://hpiers.obspm.fr/eop-pc/analysis/ceam.html (nutation) We plan to take into account the Bulletin A in order to update the geodetic excitation on a daily basis. Christian Bizouard, Daniel Gambis IERS Earth Orientation Center Paris Observatory ************************************************************************ IERS Messages are edited and distributed by the IERS Central Bureau. To subscribe or unsubscribe, please write to . Archives: http://www.iers.org/iers/publications/messages/ ************************************************************************