Updates to the IERS Conventions (2010): Chapter 9 - Models for atmospheric propagation delays
Working version last updated: 10 June 2013

Text of Chapter 9: TeX file; PDF file
Chapter 9 Figures (eps format)
See the software page for subroutine pertaining to Chapter 9.
Additional material for Chapter 9 is available here.

List of updates:

  • 25 November 2011: The header of the subroutine GPT.F has been corrected for the test case output (noted by Ian Martin).
  • 26 March 2012: The test case provided for the subroutine VMF1.F has been corrected. 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.
  • 10 August 2012: Changes with respect to previous version of the chapter:
    • In the section 9.2 "Tropospheric model for radio techniques", correct a typo in the Chen and Herring gradient mapping function.
    • 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).
  • 15 January 2013: Changes with respect to previous version of the chapter:
    • Introduce the model Global Pressure and Temperature 2 in sections 9.2 "Tropospheric model for radio techniques" and 9.3 "Sources for meteorological data" (provided by J. Boehm).
    • In the section 9.4 "Ionospheric models for radio techniques", correct some numerical values in a number of equations for using exact CODATA (2010) values of fundamental constants (noted by R. Langley). Changes are not significant with respect to the uncertainties of the quantities.
  • 10 June 2013: The subroutine GPT2.F has been updated for consistency with the version at TU Wien. This version ensures proper function at the South pole (noted by Changyong He), and the parameter "dmjd" is no longer modified by the subroutine (noted by D. Ferguson). A reference has been completed in the chapter.