==============================================================================
MEX SCLK Files
==============================================================================

  Last update:  22 MAR 2004  

  This "aareadme.txt" file describes the contents of the KERNELS/SCLK
  directory of the MEX SPICE data server.  It also provides the file 
  naming conventions used for the MEX SCLK kernels, and it provides
  identification of the most current version of SCLK files.

  SCLK files are created from the information contained in the ESOC's DDID
  Time Correlation Packets.

  All SCLK files (*.TSC) contained in this directory are unix text files.
  These may be used in a non-compatible text environment by using
  the ASCII mode of FTP to port the files.  [Ref 4b]

  Contact Jose Luis Vazquez (jlvazquez@sciops.esa.int) or Joe Zender 
  (Joe.Zender@esa.int) if you have any questions.


==============================================================================
References
==============================================================================
    1. Data Delivery Interface Document (DDID)   Issue C1 (MEX-ESC-IF-5003)
       1 July 2005

    2. SCLK Required Reading. NAIF Document No. 222.02

    3. Auxiliary Data Conversion into SPICE Kernels and Distribution. 
       (MEX-EST-PL-10210)

    4. Selected SPICE Tutorials from the NAIF server:  
ftp://naif.jpl.nasa.gov/pub/naif/toolkit_docs/Tutorials/office/individual_docs/

       a) SCLK Tutorial               13_lsk_and_sclk.ppt
       b) Porting Kernels Tutorial    09_porting_kernels.ppt


  
==============================================================================
Mars Express SCLK Directory Structure
==============================================================================
 aareadme.txt         Text file describing the directory structure, the naming
                      conventions for the SCLKs, and the current version(s) of
                      each SCLK type.

 former_versions      Subdirectory that contains obsolete versions of the 
                      SCLK files that have been updated in the Current SCLK
                      Kernels Set, and fake SCLK files used before the
                      creation of real ones.


==============================================================================
MEX Spacecraft SCLK Naming Covention      MEX_yymmdd_[spec].TSC
==============================================================================


          token           description
          ------------    --------------------------------------------------
           yymmdd         File release date.
           [spec]         Data type specification Identifier:
                             STEP   -- real SCLK files
                             FAKE   -- special fake SCLK files 


==============================================================================
Current SCLK Kernels Set
==============================================================================

 Name                  Comments
 -------------------   ------------------------------------------------------
 MEX_yymmdd_STEP.TSC   This file is a SPICE spacecraft clock (SCLK) kernel
                       containing information required for MEX spacecraft
                       on-board clock to UTC conversion. This file provides
                       the same time information that the Time Correlation
                       packets released via DDS, with the exception of 60
                       seconds before the starting time of each packet, during
                       which the clock rate was sightly adjusted to make the
                       correlation function continuous. For further discussion
                       on this topic see [Ref 3]. This file was released on
                       yymmdd.