************************************************************************ IERS Message No. 46 October 8, 2003 ************************************************************************ New interactive tools at the Earth Orientation Center Recently on the WEB site of the IERS Earth Orientation Center (http://hpiers.obspm.fr/eop-pc) a panel of "interactive" tools was developed in PHP/HTML langage for selecting, plotting, analyzing time series of the Earth orientation. More precisely users can select various sets of Earth Orientation Parameters (individual, long term, real-time series,..) over a predefined interval, correct LOD or UT1 from zonal tides effect, plot them, perform spectral analysis. For practical purposes or tests we provide the rotation matrix transforming from the terrestrial frame to the celestial frame including a prediction of 6 months. Moreover additional tools allow users to compare the atmospheric angular momentum to the total excitation of polar motion, length-of-day and nutation. By a few "clicks" such tools provide a clear and flexible representation of the phenomena involved in the Earth rotation variabilities. Christian Bizouard 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/ ************************************************************************