Data Set Overview
      =================

      Version 1.1
      -----------
      This version 1.1 data set replaces the version 1.0 data set
      (DATA_SET_ID = VG2-J-MAG-4-9.60SEC) previously archived with
      the PDS. Changes to this version include the addition of data
      columns not included in version 1.0, the modification of time
      format and flag values, and upgrade of associated labels and
      catalog templates to PDS version 3.4.

      Data Set Description
      --------------------
      This data set includes Voyager 2 Jupiter encounter magnetometer
      data from the Low Field Magnetometer (LFM) resampled at a 9.6 second
      sample rate from the 60 msec instrument sampling rate. Data coverage
      begins in the solar wind and continues until at least the first
      magnetopause crossing. The data are given in Jovicentric System III
      (1965) right handed coordinates. The data set is composed of the
      following columns: 1) time - UT of the sample in the format
      yyyy-mm-ddThh:mm:ss.sssZ, 2) spacecraft clock values
      (m65536:mod60:fds_line), 3) mag_id - magnetometer id (1 = LFM, 2 = HFM),
      4) Br - radial (Jupiter to spacecraft) B-field component, 5) Btheta -
      North/South (system III) B-field component (positive southward),
      6) Bphi - azimuthal (system III) B-field component (positive eastward),
      7) Bmag - magnitude of the averaged magnetic field components,
      8) avg_Bmag - average of the magnetic field magnitudes, 9) delta -
      magnetic latitude = arcsin(Btheta/Bmag), 10) lambda - longitude =
      180. - atan(Bphi/-Br), 11-13) rms_br, rms_bt, and rms_bn - rms vectors,
      14) npts - number of points in average.  All magnetic field
      observations are measured in nanoTesla. All of the magnetic field
      data are calibrated (see the instrument calibration description for
      more details). The Jupiter System III coordinate system is defined in
      [DESSLER1983] and the reference documents for this data set are:
      [NESSETAL1979A], [LEPPINGETAL1981], [CONNERNEYETAL1981],
      [BEHANNONETAL1981].

      These data are provided in a conventional, right handed,
      spherical coordinate system with vectors R, Theta, and Phi.
      This system is sometimes referred to as System III (1965)
      right handed coordinates. The the magnetic field components are:
        BR     - radial B-field component (along the Jupiter to
                 spacecraft line) positive away from Jupiter
        BTHETA - North/South (system III) B-field component,
                 positive southward
        BPHI   - azimuthal (system III) B-field component, positive
                 eastward

      Processing Level Id            : 4
      Software Flag                  : Y
      Processing Start Time          : 1988-09-21

      Parameters
      ==========
      Sampling Parameter Name        : TIME
      Data Set Parameter Name        : MAGNETIC FIELD VECTOR
      Sampling Parameter Resolution  : 9.600000
      Minimum Sampling Parameter     : 19770820120000.000000
      Maximum Sampling Parameter     : UNK
      Sampling Parameter Interval    : 9.600000
      Minimum Available Sampling Int : 0.060000
      Data Set Parameter Unit        : NANOTESLA
      Noise Level                    : 0.006000
      Sampling Parameter Unit        : SECOND

        PARAMETER  RESOLUTION  DESCRIPTION
        NAME       (UNITS)

        time       9.6 Sec     time of the sample (UT) in the
                               format yyyy-mm-ddThh:mm:ss.sssZ.
                               The full sampling rate for the
                               instrument is .06 +/- .006 sec.

        m65536,    (counts)    s/c clock mod 65536, mod 60 and
        mod60 and              fds line
        fds_line

        mag_id     n/a         magnetometer ID

        magnetic   (nT)        measured parameter equaling the
        field                  magnetic field strength (e.g. in
        components             nanoTeslas) along a particular axis
        (Br, Btheta,           direction. Usually the three
        Bphi)                  orthogonal axis components are
                               measured by three different sensors.

        magnetic   (nT)        derived parameter which combines the 3
        field vector           orthogonal magnetic field component
        (Bmag, avg_Bmag)       measurements.

        delta      n/a         delta = arcsin(Btheta/Bmag)

        lambda     n/a         lambda = 180. - atan(Bphi/-Br)

        rms_Br,                Pythagorean root mean square deviation
        rms_Bt, and            of the component averages
        rms_Bp

        npts       (counts)    the number of data points in the
                               current average


      Source Instrument Parameters
      ============================
      Instrument Host ID              : VG2
      Data Set Parameter Name         : MAGNETIC FIELD VECTOR
      Instrument Parameter Name       : MAGNETIC FIELD COMPONENT
      Important Instrument Parameters : 1

      Instrument Host ID              : VG2
      Data Set Parameter Name         : MAGNETIC FIELD VECTOR
      Instrument Parameter Name       : WAVE MAGNETIC FIELD INTENSITY
      Important Instrument Parameters : 1

      Processing
      ==========

      Processing History
      ------------------
      Source Data Set ID          : N/A
      Software                    : UNK
      Product Data Set ID         : VG2-J-MAG-4-9.60SEC

      Ancillary Data
      ==============
      An ancillary data file containing the derived spacecraft
      magnetic field is provided with this data at a 48 second sample
      rate. These data provide zero level offsets used in the data
      processing. S/C field data is provided in spacecraft
      coordinates as follows:

      PARAMETER  RESOLUTION  DESCRIPTION
      NAME       (UNITS)

      time       48 sec      time in format yyyy-mm-ddThh:mm:ss.sssZ
      m65536     n/a         s/c clock mod 65536
      mod60      n/a         s/c clock mod60
      mag_id     n/a         magnetometer ID
      Bx         (nT)        spacecraft coords. X component
      By         (nT)        spacecraft coords. Y component
      Bz         (nT)        spacecraft coords. Z component
      Bmag       (nT)        total magnetic field strength
      rms_Bx     (nT)        rms mag component
      rms_By     (nT)        rms mag component
      rms_Bz     (nT)        rms mag component
      npts       (counts)    number of points in average

      Data Coverage
      =============
Filename     Records           Start                     Stop
----------------------------------------------------------------------------
Volume ID: VG_1502
S3_9_6S.TAB  312886  1979-07-05T00:00:47.269Z  1979-08-12T16:55:47.008Z

Confidence Level Overview
      =========================
      This data set contains some data gaps and spikes. The data set
      does contain a flag value which has been provided by the PI
      (Norman Ness) that indicates whether or not a particular
      record has been contaminated by software error or by
      spacecraft interference (a flag value of 1 indicates a bad
      value, 0 indicates that the record has either not been
      evaluated or is good). Some records that are obviously
      contaminated have not been flagged. The hourly summary data
      will show a contamination code and data quality code of 2 when
      data in the hour have not been flagged but are obviously in
      error and a contamination code of 1 when the hour contains
      flagged records.