MER SCLK files.
===========================================================================
 
     This ``aareadme.txt'' file describes contents of the kernels/sclk
     directory of the MER SPICE data server. It was last modified on
     September 2, 2003. Contact Chuck Acton (818-354-3869,
     Chuck.Acton@jpl.nasa.gov) or Boris Semenov (818-354-8136,
     Boris.Semenov@jpl.nasa.gov) if you have any questions regarding this
     data.
 
 
Brief summary
--------------------------------------------------------
 
     This directory contains the SPICE SCLK files for the MER rover
     on-board clocks. All files are in IEEE text format and must be copied
     using ftp ASCII transfer to any non-UNIX workstation. The following
     files are present in this directory. (Only file names are shown; the
     file name extensions of the text SCLK files are always ".tsc"):
 
           MER_(1,2)_SCLKSCET*    MER-1 and MER-2 on-board clock
                                  coefficients Kernel (SCLK) files
                                  generated by converting corresponding
                                  SCLKvSCET file produced by TMOD Time
                                  Services to SPICE SCLK format using
                                  MAKCLK SPICE Utility program. In flight
                                  these files are created/delivered every
                                  time new SCLKvSCET file is delivered
                                  (usually once every two-four weeks.)
 
           mer(1,2)_hlst_*        MER-1 and MER-2 pseudo-SCLKs implementing
                                  MER hybrid (approximate) local solar time
                                  system (called ALST or HLST) for each
                                  target landing site. Refer to the example
                                  provided in this directory:
 
              ftp://naif.jpl.nasa.gov/pub/naif/MER/misc/alst/example
 
                                  to see how this SCLK can be used to
                                  convert between UTC or ET and HLST.
 
     If multiple versions of an SCLK file are provided, always use the
     latest version (unless earlier version is needed for some special
     reasons.)