PDS_VERSION_ID       = PDS3                                                   
RECORD_TYPE          = STREAM                                                 
OBJECT               = TEXT                                                   
  PUBLICATION_DATE   = 2002-09-30                                             
  NOTE               = "This file describes the contents of this directory."  
END_OBJECT           = TEXT                                                   
END                                                                           
                                                                              
This directory contains the 6 second high res. lowband data from the Cosmic   
Astronomy instrument on Voyager 1 during the Saturn encounter period of       
1980-11-11 to 1980-11-16. Each data record has 8 sweeps of measurements.      
Each sweep has 70 instrument channels each 1 kHz wide and separated by        
19.2 kHz, covering the range from 1326.0 to 1.2 kHz.                          
                                                                              
The data are stored in an ASCII tables (PRA.TAB), accompanied by a PDS        
label file (PRA.LBL) which describes properties of the data file.             
                                                                              
                                                                              
Additional information associated with this data set is available in the      
following files:                                                              
                                                                              
file                       contents                                           
                                                                              
/CATALOG/PRAINST.CAT       PRA instrument description                         
/CATALOG/VG1_PRA6DS.CAT    data set description                               
/CATALOG/PERSON.CAT        personnel information                              
/CATALOG/REF.CAT           key reference description                          
/DOCUMENT/PRA/PRAINST.ASC  ASCII and HTML versions of the PRA investigation   
          and PRAINST.HTM    description paper [WARWICKETAL1977]              
                                                                              
                                                                              
                                                                              
                   /-------------------------\                                
                   |        D A T A          |                                
                   \-------------------------/                                
                                                                              
============================================================================= 
name      type       description                                              
----------------------------------------------------------------------------- 
date      I6         year, month, and day of start of first sweep (SCET) in   
                     the format YYMMDD                                        
second    I6         seconds of day (SCET) of start of first sweep            
sweep1    I284        (see below)                                             
sweep2    I284        (see below)                                             
sweep3    I284        (see below)                                             
sweep4    I284        (see below)                                             
sweep5    I284        (see below)                                             
sweep6    I284        (see below)                                             
sweep7    I284        (see below)                                             
sweep8    I284        (see below)                                             
                                                                              
   Columns sweep1-8 consist of a 4-byte status word followed by 70 4-byte     
   low band channels 1326.0 to 1.2 kHz. For the status word the 12 least      
   significant bits have used, although not all 12 have meaning for PRA       
   low band. Numbering those bits 0 for least significant to 11 for most      
   significant, the bits that have meaning are as follows:                    
      bit                                                                     
       0: 15 dB attenuator in use when equal to 1                             
       1: 30 dB attenuator in use when equal to 1                             
       2: 45 dB attenuator in use when equal to 1                             
       9,10 (together): polarization of first channel sampled (1326.0 kHz)    
      according to the scheme:                                                
      9\10 0 1                                                                
      0    R L                                                                
      1    L R                                                                
   If the status word is zero, any data in that receiver sweep should be      
   discarded.