Data Set Overview
    =================
      THIS DATA SET CONTAINS ELECTRON PARAMETERS IN THE PLS ENERGY
      RANGE (10-5950 EV) AT SATURN DURING THE VOYAGER 1 ENCOUNTER.
      PARAMETERS ARE CALCULATED IN SEVERAL WAYS.  TOTAL MOMENT
      DENSITY AND TEMPERATURE ARE GIVEN.  EACH ELECTRON SPECTRUM IS
      ALSO FIT WITH A THERMAL COMPONENT AND 1-3 HOT COMPONENTS
      DEPENDING ON HOW MANY MAXWELLIANS ARE NEEDED TO FIT THE ENTIRE
      DISTRIBUTION.  THE MOMENT DENSITY AND TEMPERATURE OF THE HOT
      COMPONENT IS CALCULATED AFTER THE THERMAL COMPONENT IS
      SUBTRACTED FROM THE SPECTRUM.  THE CHI-SQUARE VALUE FOR EACH
      FIT IS GIVEN.  THE SPACECRAFT CHARGE IS NOT TAKEN INTO ACCOUNT,
      AND MAY RESULT IN FACTOR OF 2-3 ERRORS IN THE THERMAL ELECTRON
      DENSITY.  DATA IS UNRELIABLE INSIDE 6 RS AND IN THE OCCULTATION
      REGIONS.  A COMPLETE DESCRIPTION OF THIS DATA SET IS IN SITTLER
      ET AL. (1983).  DATA FORMAT: THE DATA SET IS IN ASC FORMAT AND
      CAN BE READ USING THE FOLLOWING FORTRAN STATEMENT:\n
 
      READ(22,999) JTIME,IMAX,IFLY,EDATA
      FORMAT(8I6,17G12.5,/,1X,10G12.5)
 
      THE PARAMETER DEFINITIONS ARE:
 
      NAME TYPE DEFINITION JTIME(1-6) I*4 YR,DAY,HR,MIN,SEC,MSEC IMAX
      ' # OF POINTS IN SPECTRUM (INCLUDES 11 PTS BELOW 10 EV FOR MOM
      INTEGRALS) IFLY ' FLAG = 0 FOR CRUISE AND =1 FOR ENCOUNTER
      EDATA(1) R*4 THBN(ANGLE BETWEEN DCUP NORMAL AND B VECTOR) 2 '
      RNE MOMENT ELECTRON DENSITY (/CM**3) 3 ' RTE ' ' TEMPERATURE
      (EV) 4 ' PHISC SPACECRAFT POTENTIAL (VOLTS) 5 ' RNC COLD
      ELECTRON DENSITY (/CM**3) 6 ' SGNC STANDARD DEVIATION OF RNC
      (/CM**3) 7 ' RTC COLD ELECTRON TEMPERATURE (EV) 8 ' SGTC
      STANDARD DEVIATION OF RTC (EV) 9 ' CHIC CHI-SQUARE OF COLD FIT
      10 ' RNH1 1ST HOT ELECTRON DENSITY (/CM**3) 11 ' SGNH1 STANDARD
      DEVIATION OF RNH1 (/CM**3) 12 ' TH1 1ST HOT ELECTRON
      TEMPERATURE (EV) 13 ' SGTH1 STANDARD DEVIATION OF TH1 (EV) 14 '
      CHIH1 CHI-SQUARE OF 1ST HOT FIT 15 ' RNH2 2ND HOT ELECTRON
      DENSITY (/CM**3) 16 ' SGNH2 STANDARD DEVIATION OF RNH2 (/CM**3)
      17 ' TH2 2ND HOT ELECTRON TEMPERATURE (EV) 18 ' SGTH2 STANDARD
      DEVIATION OF TH2 (EV) 19 ' CHIH2 CHI-SQUARE OF 2ND HOT FIT 20 '
      RNH3 3RD HOT ELECTRON DENSITY (/CM**3) 21 ' SGNH3 STANDARD
      DEVIATION OF RNH3 (/CM**3) 22 ' TH3 3RD HOT ELECTRON
      TEMPERATURE (EV) 23 ' SGTH3 STANDARD DEVIATION OF TH3 (EV) 24 '
      CHIH3 CHI-SQUARE OF 3RD HOT FIT 25 ' CHI CHI-SQUARE FOR TOTAL
      FIT 26 ' RNH MOMENT HOT ELECTRON DENSITY (/CM**3) 27 ' RTH
      MOMENT HOT ELECTRON TEMPERATURE (EV) IN COMPUTING RNH1,TH1 WE
      USED THE 3RD TO 7TH CHANNELS ABOVE THE BREAKPOINT ENERGY EB1
      AND SUBTRACTED THE COLD COMPONENT FC FROM FE (OBSERVED) BEFORE
      DOING THE FIT.  IN REALITY THIS FIT WAS DONE ITERATIVELY
      BETWEEN THE COLD AND HOT COMPONENT FITS (FC=FE-FH AND FH=FE-FC
      ETC.).  A SIMILAR APPROACH WAS USED IN COMPUTING RNH3,TH3 FOR
      WHICH A MAXWELLIAN FIT WAS DONE TO THOSE CHANNELS ABOVE EB2.
      THE PARAMETERS RNH2,TH2 WERE FIT TO THE UPPER 5 (3 MIN)
      CHANNELS (GENERALLY ABOVE EB2).  THIS FIT WAS PRIMARILY DONE TO
      ALLOW PROPER ESTIMATION OF FE TO THE HIGH ENERGY PORTION OF THE
      SPECTRUM.  IN MANY CASES THERE ARE NOT SUFFICIENT POINTS TO
      COMPUTE RNH3,TH3 AND RNH2,TH2 DO PROVIDE A FAIR REPRESENTATION
      OF THE SPECTRUM.  IF RNH1=RNH2=RNH3 THEN YOU SHOULD NOT USE THE
      2ND AND 3RD FIT PARAMETERS.  VALUES OF 1.E32 INDICATE THAT THE
      PARAMETER COULD NOT BE OBTAINED FROM THE DATA USING THE
      STANDARD ANALYSIS TECHNIQUE.  ADDITIONAL INFORMATION ABOUT THIS
      DATASET AND THE INSTRUMENT WHICH PRODUCED IT CAN BE FOUND
      ELSEWHERE IN THIS CATALOG.  AN OVERVIEW OF THE DATA IN THIS
      DATA SET CAN BE FOUND IN SITTLER ET AL.  (1983) AND A COMPLETE
      INSTRUMENT DESCRIPTION CAN BE FOUND IN BRIDGE (1977).
 
 
      Processing Level Id            : 5
      Software Flag                  : Y
 
 
    Parameters
    ==========
      Sampling Parameter Name        : TIME
      Data Set Parameter Name        : ELECTRON DENSITY
      Sampling Parameter Resolution  : 96.000000
      Sampling Parameter Interval    : 96.000000
      Minimum Available Sampling Int : 96.000000
      Data Set Parameter Unit        : CM-3
      Sampling Parameter Unit        : SECOND
 
 
      Description
      -----------
        A derived parameter giving an indication of the mean A
        derived parameter equaling the number of electrons per unit
        volume over a specified range of electron energy.
        energy/electron, assuming the shape of the electron energy
        Different forms of electron density are derived spectrum to
        be Maxwellian (i.e.highest entropy shape).  Given
        distinguished by method of derivation (Maxwellian fit, that
        the electron energy spectrum is not exactly Maxwellian,
        method of moments) or by the some selection criteria (ie.,
        the electron temperature can be defined integrally (whereby
        the mean energy obtained by integrating under the actual hot
        electron and cold electron density).  In general, if more
        electron energy spectrum is set equal to the integral under
        than one electron component is analyzed, either by moment or
        fit, a total density will be provided which is the sum of a
        Maxwellian, where the temperature is a free parameter for the
        electron densities.  If the electron do not have a which to
        solve), or differentially (whereby the slopes of Maxwellian
        distribution the actual distribution can be the actually
        electron energy spectrum at various energies are matched to
        the slopes of a corresponding Maxwellian).  represented as
        the sum of several Maxwellians, in which case the density of
        each Maxwellian is given.  The temperature parameter is often
        qualified with a range of applicable energies.  temperatures
        can be angularly anisotropic.  If the electrons do not have a
        Maxwellian distribution the actual distribution can be
        represented as the sum of several Maxwellians, each with a
        separate temperature.
 
 
    Source Instrument Parameters
    ============================
      Instrument Host ID              : VG1
      Data Set Parameter Name         : ELECTRON DENSITY
      Instrument Parameter Name       : ELECTRON RATE
      Important Instrument Parameters : 1
 
      Instrument Host ID              : VG1
      Data Set Parameter Name         : ELECTRON DENSITY
      Instrument Parameter Name       : ELECTRON CURRENT
      Important Instrument Parameters : 1
 
      Instrument Host ID              : VG1
      Data Set Parameter Name         : ELECTRON TEMPERATURE
      Instrument Parameter Name       : ELECTRON RATE
      Important Instrument Parameters : 1
 
      Instrument Host ID              : VG1
      Data Set Parameter Name         : ELECTRON TEMPERATURE
      Instrument Parameter Name       : ELECTRON CURRENT
      Important Instrument Parameters : 1
 
 
    Processing
    ==========
      N/A

Overview
    ========
      THIS DATA SET PROVIDES AN ESTIMATE OF THE ELECTRON PARAMETERS
      IN THE PLS ENERGY RANGE (10-5950 EV).  THE THERMAL ELECTRON
      DENSITY MAY BE UNDERESTIMATED BY FACTORS OF 2-3 IN SOME REGIONS
      DUE TO NEGATIVE SPACECRAFT CHARGING.  THERMAL ELECTRON
      PARAMETERS ARE ALSO UNRELIABLE INSIDE SIX KRONIAN RADII WHERE
      ELECTRON TEMPERATURES ARE COLD AND IN THE OCCULTATION REGIONS.
      HOT ELECTRONS ARE RELATIVELY UNDISTURBED BY CHARGING AND THESE
      PARAMETERS HAVE UNCERTAINTIES OF LESS THAN 20%.