Galileo EPD Pre-Jupiter Raw Bundle                                           
                                                                             
Galileo EPD Pre-Jupiter Raw Venus Pitch Angle Distribution Data Collection   
                                                                             
DATA_SET_ID                    = GO-V-EPD-2-SAMP-PAD-V1.0                    
DATA_SET_NAME                  =                                             
GO VEN EPD EDITED SAMPLE PITCH ANGLE DISTRIBUTIONS V1.0                      
START_TIME                     = 1990-02-10T05:30:13                         
STOP_TIME                      = 1990-02-10T06:38:30                         
DATA_SET_RELEASE_DATE          = 1993-12-07                                  
PRODUCER_FULL_NAME             = Christopher R. Brull                        
                                                                             
References:                                                                  
GO VEN EPD EDITED SAMPLE PITCH ANGLE DISTRIBUTIONS V1.0,                     
GO-V-EPD-2-SAMP-PAD-V1.0, NASA Planetary Data System, 1995                   
                                                                             
These data were originally archived in the following PDS3 data set:          
GO-V-EPD-2-SAMP-PAD-V1.0 (https://doi.org/10.17189/1519696).                 
                                                                             
Collection Overview                                                          
====================                                                         
This collection contains count rate data for the                             
energetic particle detector obtained from the LEMMS telescope during         
the time of significant activity during the Venus encounter.  (5:45 -        
5:50 and 6:12 - 6:27) Each record contains count rate data for               
each of 17 LEMMS channels.  (The CMS telescope was not powered up            
during the Venus encounter.)  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 Venus (calculated with       
SPICE kernel data).  The z-axis of the coordinate system points along        
the magnetic field.  The x-axis is chosen so Venus 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.  All of the data was taken         
with the telescope perpendicular to the spacecraft spin axis (motor          
step position = 4).  The rates reported are in units of counts/sec.          
Pitch and phase angles are recorded in radians.                              
                                                                             
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.            
                                                                             
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.