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</o:shapelayout></xml><![endif]--></head><body lang=FR link=blue vlink=purple><div class=WordSection1><p class=MsoPlainText><font size=2 face=Calibri><span style='font-size:11.0pt'>Author: Gérard Petit (IERS Conventions Center)<o:p></o:p></span></font></p><p class=MsoPlainText><font size=2 face=Calibri><o:p> </o:p></font></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'>Information on the updates to the IERS Conventions (2010)<o:p></o:p></span></font></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'>The IERS Conventions Center informs of the following updates:<o:p></o:p></span></font></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><b><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt;font-weight:bold'>10 August 2012<o:p></o:p></span></font></b></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'>* Chapter 5 "Transformation between the ITRS and GCRS" has been updated, see http://tai.bipm.org/iers/convupdt/convupdt_c5.html .<o:p></o:p></span></font></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'> o Report the yearly update fcnnut120701 to the Free Core Nutation model and correct a typo in the value of the FCN period. <o:p></o:p></span></font></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'>* Chapter 6 "Geopotential" has been updated, see http://tai.bipm.org/iers/convupdt/convupdt_c6.html .<o:p></o:p></span></font></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'> o In the section 6.3.2 "Ocean tide models", part "FES2004", it is specified how to treat the zonal terms in order to get consistent values for the Stokes coefficients. <o:p></o:p></span></font></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'>* Chapter 9 "Models for atmospheric propagation delays" has been updated, see http://tai.bipm.org/iers/convupdt/convupdt_c9.html .<o:p></o:p></span></font></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'> o In the section 9.2 "Tropospheric model for radio techniques", correct a typo in the Cheng and Herring gradient mapping function.<o:p></o:p></span></font></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'> o In the section 9.4.1 "Ionospheric delay dependence on radio signals including higher order terms", the part "Ray bending effects on geometric path excess and ionospheric delay" has been updated (from E. Petrie and M. Hernandez Pajares). <o:p></o:p></span></font></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'>Announcement for the following past updates were not circulated in due time:<o:p></o:p></span></font></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><b><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt;font-weight:bold'>21 December 2011<o:p></o:p></span></font></b></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'>* Chapter 8 "Tidal variations in the Earth's rotation" has been updated, see http://tai.bipm.org/iers/convupdt/convupdt_c8.html .<o:p></o:p></span></font></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'>The subroutine RG_ZONT2 has been corrected for a typo in the sine coefficient of the 365.26 period for delta LOD (Noted by J. Lundberg). The effect is of order a ns in the length of day. <o:p></o:p></span></font></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'>* The Glossary has been updated, see http://tai.bipm.org/iers/convupdt/convupdt_gl.html . <o:p></o:p></span></font></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'>In the term "celestial pole offsets", "IAU 2000A" should be replaced by "IAU 2006/2000".<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><b><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt;font-weight:bold'>26 March 2012<o:p></o:p></span></font></b></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'>* Chapter7 " Displacements of reference points " has been updated, see http://tai.bipm.org/iers/convupdt/convupdt_c7.html .<o:p></o:p></span></font></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'>Have been modified to account for the next leap second to occur June 30, 2012:<o:p></o:p></span></font></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'> o The subroutine HARDISP.F and its subroutine ETUTC.F<o:p></o:p></span></font></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'> o The subroutine DEHANTTIDEINEL.F and its subroutines from the SOFA package DAT.F and CAL2JD.F.<o:p></o:p></span></font></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'>Note that the previous version of DEHANTTIDEINEL.F, which is the one available on the Conventions 2010 web page, erroneously did not include an update dated April 10, 2009. The new version reinstalls this update (a 0.05 mm effect).<o:p></o:p></span></font></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'>* Chapter 9 "Models for atmospheric propagation delays" has been updated, see http://tai.bipm.org/iers/convupdt/convupdt_c9.html .<o:p></o:p></span></font></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'>The test case provided for the subroutine VMF1.F has been corrected. <o:p></o:p></span></font></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'>The subroutine VMF1_HT.F has been corrected for an error in the computation of the quantity VMF1H (noted by J. McCarthy) and for the test case.<o:p></o:p></span></font></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'>The USNO web site http://maia.usno.navy.mil/conv2010/convupdt.html will be updated shortly.<o:p></o:p></span></font></p><p class=MsoPlainText><span lang=EN-US><o:p> </o:p></span></p><p class=MsoPlainText><font size=2 face=Calibri><span style='font-size:11.0pt'>Gérard Petit and Brian Luzum<o:p></o:p></span></font></p><p class=MsoPlainText><font size=2 face=Calibri><span style='font-size:11.0pt'>IERS Conventions Center<o:p></o:p></span></font></p><p class=MsoPlainText><font size=2 face=Calibri><o:p> </o:p></font></p><p class=MsoPlainText><font size=2 face=Calibri><o:p> </o:p></font></p><p class=MsoPlainText><font size=2 face=Calibri><o:p> </o:p></font></p></div></body></html>