Galileo EPD Pre-Jupiter Raw Bundle                                            
                                                                                  
    Galileo EPD Pre-Jupiter Edited Raw Earth2 Count Rate Data Collection          
                                                                                  
    PDS3 DATA_SET_ID               = GO-E-EPD-2-SAMP-EARTH2-PAD-V1.0              
    PDS3 DATA_SET_NAME             =                                              
    GO EARTH EPD EDITED SAMPLE PITCH ANGLE DISTRIBUTIONS V1.0                     
    START_TIME                     = 1992-12-08T00:00:36                          
    STOP_TIME                      = 1992-12-08T23:58:48                          
    PDS3 DATA_SET_RELEASE_DATE     = 1995-06-29                                   
    PRODUCER_FULL_NAME             = CHRISTOPHER R. BRULL                         
                                                                                  
    References:                                                                   
    Williams, D. J., R. W. McEntire, S. M. Krimigis, E. C. Roelof, S.             
    Jaskulek, B. Tossman, B. Wilken, W. Studemann, T. P. Armstrong,               
    T. A. Fritz, L. J. Lanzerotti, J. G. Roederer                                 
                                                                                  
    These data were originally archived in the following PDS3 data set:           
    GO-E-EPD-2-SAMP-EARTH2-PAD-V1.0 (https://doi.org/10.17189/1519638).           
                                                                                  
  Collection Overview                                                             
  =================                                                               
    This collection contains count rate data for the energetic                    
    particle detector obtained from the LEMMS and CMS telescopes during the       
    time of significant activity during the Earth2 encounter on day 343, 1992.    
    A data file record contains a single sector's data for a particular           
    LEMMS or CMS channel.  Also included are pitch and phase angles of the        
    particles counted by the detectors.                                           
                                                                                  
    The angles are determined in a coordinate system defined by the               
    magnetic field (magnetic field data provided by Steve Joy) and the            
    position of Earth (calculated with SPICE kernel data).  The z-axis of         
    the coordinate system points along the magnetic field.  The x-axis is         
    chosen so Earth lies in the xz plane.  The pitch angle is the angle           
    between the sector look direction and the z-axis.  The phase angle is         
    the angle between x-axis and the projection of the x-axis on the xy           
    plane.  During the encounter, the stepper motor was moving from               
    position zero thru five.  Steps one through five are reported in this         
    data set.  The rates reported are in units of counts/sec.  Pitch and          
    phase angles are recorded in radians.                                         
                                                                                  
    Model data is used to fill in a large gap in magnetic field data              
    during day 343.  Magnetic field directions from 1992-343T13:40:00Z            
    through 1992-343T16:11:00Z are generated by the Tsygenenko 1987               
    model.  During the gap in magnetic field data, the T87                        
    data is used to calculate the pitch and phase angles.                         
                                                                                  
    NOTE                                                                          
                                                                                  
    Data in this collection includes only that data which has valid data          
    flag markers as a result of processing done by the Galileo Energetic          
    Particles Detector Archive Processor. Invalid data are                        
    marked by a -1.0 in the rate column of the invalid data. The data             
    after hour sixteen is particularly noisy.                                     
                                                                                  
    Depending on the tools used for EPD data analysis, it is possible to encounter
    the pitch angle of the detector being substituted for the pitch angle of the  
    charged particles. For example, in Figure 4 of Williams et al. (1998),        
    J. Geophys. Res., 103, 17,523-17,534, the authors show a loss at 0 deg PA,    
    which if viewed carefully must be at 180 deg PA. It is therefore useful to    
    exercise caution with pitch angles in the EPD data, depending on how the data 
    are obtained.