Data Set Overview
        =================
          THIS DATA SET CONTAINS THE ION PARAMETERS IN THE PLS VOLTAGE
          RANGE (10-5950 EV/Q) WITH FORMAL 1 SIGMA ERRORS OBTAINED FROM
          VOYAGER 2 DATA AT SATURN BY FITTING THE MEASURED SPECTRA WITH
          ISOTROPIC MAXWELLIAN DISTRIBUTIONS TO OBTAIN PLASMA DENSITIES,
          TEMPERATURES, AND VELOCITY.  ONLY SPECTRA WHICH HAD DISTINCT
          CURRENT PEAKS WERE FIT.  SPECTRA WERE FIT USING ONE OR TWO ION
          SPECIES, PROTONS AND/OR A HEAVY ION WHICH WAS TAKEN TO BE
          NITROGEN OUTSIDE OF 14 RS AND OXYGEN ELSEWHERE.  OUTSIDE
          L=10-12 ION SPECTRA CHANGE RAPIDLY, SO THE VALUES IN THIS DATA
          SET DO NOT REPRESENT AVERAGE PLASMA CONDITIONS IN THE OUTER
          MAGNETOSPHERE.  THE VALUES FOR POSITION AND MAGNETIC FIELD
          GIVEN IN THE DATA SET ARE ONLY APPROXIMATE AND SHOULD NOT BE
          USED FOR PUBLICATION.  PARAMETERS WHICH ARE IDENTICALLY 0 AND
          HAVE UNCERTAINTIES OF 0 WERE NOT FIT DUE TO INSUFFICIENT DATA;
          THESE NUMBERS ARE THUS NOT REAL VALUES.  A COMPLETE DESCRIPTION
          OF THIS DATA SET IS GIVEN IN RICHARDSON (1986).


          DATA FORMATS ARE GIVEN AS BELOW:


          ================================================================
          name      type       description
          ----------------------------------------------------------------
          time      A24        time in the format yyyy-mm-ddThh:mm:ss.sssZ
          r         1PE11.4    spacecraft radial distance from planet
                                 (planetary radii)
          rho       1PE11.4    spacecraft position angle rho (radians)
          brho      1PE10.3    rho component of magnetic field (nT)
          bphi      1PE10.3    phi component of magnetic field (nT)
          bz        1PE10.3    z component of magnetic field (nT)
          mode      A2         intrument mode (L or M)
          fdate     A10        date the fit was performed (MMDDYY)
          who       A6         intitials of person performing fit
                                 (JDR = Dr. John Richardson, MIT)
          chi2      1PE10.3    chi squared for the fit
          num_fit   I3         number of ion species fit
          ionspec1  I3         atomic number of first ion species for
                                 the fit
          ionmass1  I3         mass of the first ion species for the
                                 fit (amu)
          ionchrg1  I3         char of the first ion species for the fit
          den1      1PE10.3    denisty of the first ion species for
                                 the fit (cnts/cm**3)
          xden1     1PE10.3    1 sigma uncertainty for den1 (cnts/cm**3)
          vrho1     1PE10.3    velocity vector rho component of 1st ion
                                 species (cm/sec)
          xvrho1    1PE10.3    1 sigma uncertainty for vrho1 (cm/sec)
          vphi1     1PE10.3    velocity vector phi component of 1st
                                 ion species (cm/sec)
          xvphi1    1PE10.3    1 sigma uncertainty for vphi1 (cm/sec)
          vz1       1PE10.3    velocity vector z component of 1st ion
                                 species (cm/sec)
          xvz1      1PE10.3    1 sigma uncertainty for vz1 (cm/sec)
          wpar1     1PE10.3    thermal speed in parallel direction
                                 (cm/sec)
          xwpar1    1PE10.3    1 sigma uncertainty for wpar1 (cm/sec)
          wper1     1PE10.3    thermal speed in perpendicular direction
                                 (cm/sec)
          xwper1    1PE10.3    1 sigma uncertainty for wper1 (cm/sec)
          ionspec2  I3         atomic number of second ion species for
                                 the fit
          ionmass2  I3         mass of the second ion species for the
                                 fit (amu)
          ionchrg2  I3         char of the second ion species for the fit
          den2      1PE10.3    denisty of the second ion species for the
                                 fit (cnt/cm**3)
          xden2     1PE10.3    1 sigma uncertainty for den2 (cnts/cm**3)
          vrho2     1PE10.3    velocity vector rho component of 2nd ion
                                 species (cm/sec)
          xvrho2    1PE10.3    1 sigma uncertainty for vrho2 (cm/sec)
          vphi2     1PE10.3    velocity vector phi component of 2nd ion
                                 species (cm/sec)
          xvphi2    1PE10.3    1 sigma uncertainty for vphi2 (cm/sec)
          vz2       1PE10.3    velocity vector z component of 2nd ion
                                 species (cm/sec)
          xvz2      1PE10.3    1 sigma uncertainty for vz2 (cm/sec)
          wpar2     1PE10.3    thermal speed in parallel direction
                                 (cm/sec)
          xwpar2    1PE10.3    1 sigma uncertainty for wpar2 (cm/sec)
          wper2     1PE10.3    thermal speed in perpendicular direction
                                 (cm/sec)
          xwper2    1PE10.3    1 sigma uncertainty for wper2 (cm/sec)


          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
          RICHARDSON (1986) 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        : ION 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 EQUALING THE VECTOR MOMENTUM FRAME OR
            VELOCITY FRAME TO WHICH ONE MUST TRANSFORM IN A derived
            parameter equaling the number of ions per unit ION THERMAL
            SPEED: A measure of the velocity associated with ORDER TO
            YIELD ION ANGULAR DISTRIBUTIONS AND-OR the temperature of the
            ions.  It is formally defined as the volume over a specified
            range of ion energy, energy/charge, ELECTRON ANGULAR
            DISTRIBUTIONS THAT ARE ANGULARLY Ion Thermal Speed squared
            equals two times K (Boltzmann's or energy/nucleon.
            Discrimination with regard to mass and or ISOTROPIC AT ALL
            ENERGIES.  SUCH A FRAME CAN BE constant) times T (temperature
            of ion) divided by M (ion charge state is necessary to obtain
            this quantity, however, FOUND ONLY IF OTHER EFFECTS THAT CAN
            YIELD ANGULAR mass).  Each component of a plasma has a
            thermal speed mass and charge state are often assumed due to
            instrument limitations.  associated with it.  ANISOTROPIES
            (E.G.  SPATIAL GRADIENTS) ARE


            FACTORED OUT.  THE COMPONENT OF THE TRANSFORM VELOCITY VECTOR
            PERPENDICULAR TO THE LOCAL Many different forms of ion
            density are derived.  Some are MAGNETIC FIELD VECTOR IS
            COUPLED TO THE distinguished by their composition (N+,
            proton, ion, etc.) APPROXIMATELY TIME STATIONARY ELECTRIC
            FIELD.  or their method of derivation (Maxwellian fit, method
            of PARALLEL TO THE LOCAL MAGNETIC FIELD VECTOR A FLOW
            moments).  In some cases, more than one type of density will
            VELOCITY FRAME MAY OR MAY NOT BE A WELL DEFINED be provided
            in a single data set.  In general, if more than QUANTITY.  one
            ion species is analyzed, either by moment or fit, a total
            density will be provided which is the sum of the ion
            densities.  If a plasma component does not have a Maxwellian
            distribution the actual distribution can be represented as
            the sum of several Maxwellians, in which case the density of
            each Maxwellian is given.




        Source Instrument Parameters
        ============================
          Instrument Host ID              : VG2
          Data Set Parameter Name         : ION DENSITY
          Instrument Parameter Name       : ION RATE
          Important Instrument Parameters : 1


          Instrument Host ID              : VG2
          Data Set Parameter Name         : ION DENSITY
          Instrument Parameter Name       : ION CURRENT
          Important Instrument Parameters : 1


          Instrument Host ID              : VG2
          Data Set Parameter Name         : ION THERMAL SPEED
          Instrument Parameter Name       : ION RATE
          Important Instrument Parameters : 1


          Instrument Host ID              : VG2
          Data Set Parameter Name         : ION THERMAL SPEED
          Instrument Parameter Name       : ION CURRENT
          Important Instrument Parameters : 1


          Instrument Host ID              : VG2
          Data Set Parameter Name         : ION DENSITY
          Instrument Parameter Name       : PARTICLE MULTIPLE PARAMETERS
          Important Instrument Parameters : 1




        Processing
        ==========


          Processing History
          ------------------
            Source Data Set ID          : VG2-PLS
            Software                    : MJSANL
            Product Data Set ID         : VG2-S-PLS-5-ION-FIT-96.0SEC




          Software 'MJSANL'
          -----------------
            Software Name               : MJSANL
            Software Type               : PIN
            Software Release Date       : N/A
            Node ID                     : N/A
            Cognizant Engineer          : N/A
            Software Access Description : N/A

Confidence Level:
    =================


          THIS DATA SET PROVIDES AN ESTIMATE OF THE ION PARAMETERS IN THE
          PLS ENERGY RANGE (10-5950 EV).  FORMAL 1 SIGMA UNCERTAINTIES
          FOR THE DERIVED VELOCITIES, DENSITIES, AND THERMAL SPEEDS AND
          RANGE FROM A FEW TO 100%.  SYSTEMATIC ERRORS MAY RESULT FROM
          THE USE OF ISOTROPIC MAXWELLIAN DISTRIBUTIONS TO MODEL THE
          IONS, WHICH RESULTS IN AN UNDERESTIMATE OF THE TOTAL ION
          DENSITY AND ION THERMAL SPEED OF LESS THAN 20%, BUT HAS LITTLE
          EFFECT (FEW PERCENT) ON THE VELOCITY DETERMINATION.  POSITION
          AND MAGNETIC FIELD DATA IN THIS DATA SET ARE ONLY APPROXIMATE
          AND SHOULD NOT BE RELIED UPON.  ONLY SPECTRA WITH AT LEAST ONE
          CURRENT PEAK WERE FIT; THIS GIVES A BIASED SELECTION OF THE
          DATA, PARTICULARLY OUTSIDE L=10 WHERE THE DATA GIVEN IS NOT
          REPRESENTATIVE OF 'AVERAGE' PLASMA CONDITIONS.  SEE RICHARDSON
          (1986) FOR DETAILS.




    Data Coverage
    ==================
    Filename Records Start                     Stop
    ---------------------------------------------------------------------
    Volume ID: VG_1601
    ION_FIT.TAB  104  1981-08-25T07:21:12.002Z  1981-08-26T01:33:59.937Z
    PLS_CUP.TAB  104  1981-08-25T07:21:12.002Z  1981-08-26T01:33:59.937Z




    Missing Data Flag
    ==================
    Any data column whose value is  -9.999e+10 is a missing data value.