****************************************************************************** dorismail 21-Sep-2010 20:34:58 Message No 0700 ****************************************************************************** Author: =?iso-8859-1?Q?G=E9rard_Petit?= Subject: updated IERS Conventions Chapters 6, 7, 9 Author: Gérard Petit (IERS Conventions Center) Information on the updates to the IERS Conventions The IERS Conventions Center informs of the following updates. Three chapters of the IERS Conventions have been updated: * Chapter 6 "Geopotential" has been updated on 19 September 2010, see http://tai.bipm.org/iers/convupdt/convupdt_c6.html. The section 6.3 "Effect of the ocean tides" has been rewritten, and the tide model FES2004 is described (main contributors are S. Bettadpur, R. Biancale and J. Ries). The introduction has been expanded to present general notions. * Chapter 7 "Displacement of reference points" has been updated on 21 September 2010, see http://tai.bipm.org/iers/convupdt/convupdt_c7.html. The chapter has been reorganized to consider three kinds of displacements, see the chapter's introduction for details. A new section treats "S1-S2 atmospheric pressure loading" based on the work of T. van Dam and R. Ray; the model is implemented at http://geophy.uni.lu/ggfc-about/tide-loading-calculator.html, see the text for details. * Chapter 9 "Models for propagation delays" has been updated on 21 September 2010: see http://tai.bipm.org/iers/convupdt/convupdt_c9.html. A mean a priori model for gradients is given along with information on its use for radio techniques (provided by J. Boehm). Gérard Petit and Brian Luzum IERS Conventions Center Please do not reply directly to this message, but send comments and suggestions to IDS.central.bureau@cls.fr