PDS_VERSION_ID                = PDS3
RECORD_TYPE                   = STREAM
OBJECT                        = TEXT
  NOTE                        = "Comments on Mars Exploration Rover 
                                 Moessbauer EDR data" 
  PUBLICATION_DATE            = 2009-11-18
END_OBJECT                    = TEXT
END


            COMMENTS ON MER MOESSBAUER EDR DATA


November 18, 2009. Release 22, sols 1801-1890.
----------------------------------------------

This release includes new MB EDR data products for sols 1801-1890 for MER-B
only, and some reprocessed MB EDRs from previous deliveries. The reprocessed 
data are from sols 1-1800 from both rovers. Reprocessing was done to correct 
errors found in the processing software. A list of reprocessed products is 
in the file REPROCESSED.TXT in the INDEX directory.

August 12, 2008. 
----------------

The EDR label file size indicated in the label is incorrect.  This is 
due to a missing carriage return at the end of the label entry for 
MISSION_PHASE_NAME.

Note: This is true of all MB EDRs released.

           
May 21, 2007. 
-------------

PDS labels for files in the CALIB directory have been provided.


February 1, 2007. Release 11, Sols 811-900
------------------------------------------

A minor systematic error occurs in the PDS labels of MB EDR products
in this release. The value for the keyword TLM_INST_DATA_HEADER_ID is
not a valid ASCII character. The value should be 3.


February 3, 2006: MER Release 7, Sols 451-540
---------------------------------------------

Starting on sol 461, the MER-A (Spirit) Moessbauer counter configuration 
was changed to accumulate 14.4 keV data only.  A detailed explanation of 
this change is in preparation and will be added to the data set shortly.
The change applies only to the Moessbauer instrument on MER-A.

February 28, 2005: MER Release 3, Sols 91-180
---------------------------------------------

For release 3 of the MER Moessbauer archives there are velocity
calibration files for surface measurements and the CCT in the CALIB
directory.  These files consist of 13 columns: one per each
temperature window.  Columns 1, 2, and 12 are empty because the
instruments never reached those temperatures on Mars.  The last
temperature window contains a room temperature extrapolation of the
velocity scale.  That is the velocity scale currently provided with
the MGV files.

The velocity calibration data are provided in comma delimited files.
PDS labels will be added to the archive when they are available.

Mineralogical interpretations by the Moessbauer Team of the Moessbauer
data have been published in the following articles.

   Morris, R.V., et al., Mineralogy at Gusev Crater from the
   Moessbauer Spectrometer on the Spirit Rover, Science, 305, 833-836,
   2004.

   Klingelhoefer, G., et al., Jarosite and hematite at Meridiani
   Planum from Opportunity's Moessbauer Spectrometer, Science, 306,
   1740-1745, 2004.