PDS_VERSION_ID        = PDS3                                                  
RECORD_TYPE           = VARIABLE_LENGTH                     
RECORD_BYTES          = UNK                                                 
SPACECRAFT_NAME       = "CASSINI ORBITER"
INSTRUMENT_NAME       = "COMPOSITE INFRARED SPECTROMETER"
MISSION_PHASE_NAME    = "SATURN TOUR"

OBJECT                = TEXT                                                  
  INTERCHANGE_FORMAT    = ASCII                                               
  PUBLICATION_DATE      = 2005-07-01                                          
  NOTE                  = "N/A"                                               
END_OBJECT            = TEXT                                                  
                                                                              
END                                                                           
                                                                              
                    Cassini Composite Infrared Spectrometer                   
                      Time Sequential Data Record Archive                     
                                                                              
                               ERRATA.TXT                                     
                              23 May  2005
                               C.A. Nixon                                     
                         University of Maryland
                                                                              
                                                                              
==============================================================================
INTRODUCTION                                                                  
==============================================================================
                                                                              
This file contains a listing of errors, anomalies, and other notes       
regarding the data archive from the Cassini orbiter CIRS instrument.      
                                                                              
Although considerable care has gone into making this volume, errors are 
both possible and likely. Users of the data are advised to exercise
the same caution as they would when dealing with any other unknown
data set.

Reports of errors or difficulties would be appreciated. Please contact
one of the persons listed herein.
                                                                              
==============================================================================
ERRORS, ANOMALIES, AND OTHER NOTES                                            
==============================================================================
  
.Although considerable care has gone into making this volume, errors are 
both possible and likely. Users of the data are advised to exercise
the same caution as they would when dealing with any other unknown
data set.

Reports of errors or difficulties would be appreciated. Please contact
one of the persons listed herein.
                                                                              
==============================================================================
ERRORS, ANOMALIES, AND OTHER NOTES                                            
==============================================================================
  
CIRS interferogram data suffers from a number of external interferences,
especially:

- an 8 Hz spike pattern due to the spacecraft clock ticks.
- a 1/2 Hz spike pattern due to the Bus Interface Unit, transfer of data.
- a sine wave of variable frequency which appears correlated with the 
  electronics board temperature.
- scan speed fluctuations which have been traced to two mechanical vibrations
  on the spacecraft: (a) the MIMI LEMMS actuator (b) the reaction wheels used
  to turn the spacecraft.

These various effects are described in more detail in the 
cirs_interferences.pdf document found in the DOC directory.