PDS_VERSION_ID       = PDS3                                                   
RECORD_TYPE          = STREAM                                                 
OBJECT               = TEXT                                                   
  PUBLICATION_DATE   = 2000-04-10                                             
  NOTE               = "Text describes the data."                             
END_OBJECT           = TEXT                                                   
END                                                                           
                                                                              
 Galileo Magnetometer Jupiter Approach, Io Encounter, and J0C EDR/MRO Data    
 Mission Phase Name: Jupiter 0 Orbit                                          
                                                                              
 The EDR files contain data acquired by the Galileo Magnetometer during the   
 Jupiter Approach (solar wind -> magnetosphere), Io, and Jupiter orbit 0 in   
 the J0C mission phase. The data were returned to Earth by Memory Read Out    
 (MRO, 80 byte).                                                              
                                                                              
 EDR file names correspond to the date of the Memory Read Out (MRO) of the    
 data. They follow the convention 'Tyydddx'. The initial 'T' (indicating a    
 time-based the file name) is followed by the year 'yy' and day-of-year       
 'ddd'. The final 'x' is a sequencing letter (A, B, C, ...) used only when    
 multiple MRO's occur on the same day. The file extension '.DAT' indicates    
 a binary data file, and '.LBL' is used for PDS label files.                  
                                                                              
 The data acquisition strategy at Io was somewhat complex. Initially the      
 optimal averager (Opt/Avg) was started with 2 minute averages, then switched 
 to 1 minute averages an hour or so before Io. There was another Opt/Avg on   
 command set to provide coverage outbound from Jupiter post JOI. After the    
 DMS anomaly, the MAG team decided not to risk the Io Opt/Avg data embedded   
 in the Io LRS recording. Since it was too late to have the command removed   
 from the JOI sequence when the DMS anomaly occurred, the MAG team set the    
 Opt/Avg to take 16 hour avg in the JOI sequence. This second on command      
 reset the time tag and began overwriting the Io data until the data was read 
 out on Dec 30. The Io raw data was made redundant when the recorded data was 
 successfully returned during the J0 and G1 cruise playbacks. The Jupiter     
 approach and J0C data are the only data acquired during those times.         
                                                                              
 The EDR files were delivered to the Galileo Magnetometer Team by the Galileo 
 project. The EDR files are given in IBM 370 binary representation and are    
 stored in an an extremely compact format. The structure of the EDR files is  
 completely described in the documents GLL280 and GLL640. The pages pertinent 
 to the MAG description have been scanned into bit map images (TIFF) that are 
 stored in the DOCUMENT directory off the root of this volume.