Data Set Information
DATA_SET_NAME VG2 JUP MAG RESAMPLED SYSTEM III (1965) COORDS 48.0SEC V1.1
DATA_SET_ID VG2-J-MAG-4-SUMM-S3COORDS-48.0SEC-V1.1
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION Voyager 2 Magnetometer (MAG) data in System III (1965) coordinates from the Jupiter encounter. The data set provides 48 second averages of the magnetic field data.
DATA_SET_DESCRIPTION 
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-4-48.0SEC) 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 48 second sample rate. The data are given in
      Jovicentric System III right handed coordinates and have been
      averaged from the 60 ms instrument sample rate to a 48 second
      resampled rate. Ephemeris data, provided in 96 second sampled
      System III (1965) coordinates, have been merged into the data
      files for this data set. The ephemeris data, generated from
      Voyager 2 SEDR and provided by the Voyager MAG Team, are part
      of the data set VG2-J-POS-6-SUMM-S3COORDS-V1.1. The position
      vectors for times at which ephemeris is not provided have been
      flagged.

      The data set consists of the following columns: 1) UT of the
      sample in the format yyyy-mm-ddThh:mm:ss.sssZ, 2-4) spacecraft
      clock (m65536, mod60, fds-line), 5) magnetometer id (1 = LFM,
      2 = HFM), 6) Br radial (Jupiter to spacecraft) B-field
      component, 7) Btheta (North/South system III B-field
      component, positive southward), 8) Bphi (azimuthal system III
      B-field component, positive eastward), 9) Bmag (magnitude of
      the averaged components), 10) avg_Bmag (average of the
      magnetic field magnitudes), 11) delta (latitude =
      arcsin(Btheta/Bmag)), 12) lambda (longitude = 180. -
      atan(Bphi/-Br)), 13-15) rms vectors, 16) sc_r (Jupiter to
      spacecraft range), 17) sc_lat (jovicentric latitude, positive
      northward), 18) sc_lon (jovicentric east longitude, system III
      1965) 19) npts (number of points in average), 20) data flag -
      a flag value that indicates either software error or
      spacecraft hardware interference reduced confidence in this
      record (flag value of 1 is bad, 0 is good or unchecked). All
      magnetic field observations are measured in nanoTesla. The
      coordinate system for this data set is System (1965) III. 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].
      For more information regarding the ephemeris data, please
      refer to the data set catalog file for the data set
      VG2-J-POS-6-SUMM-S3COORDS-V1.1.

      These data a 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 vectors 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

      System III (1965) spherical coordinates, the system in which
      the ephemeris data are expressed, is a jovicentric left handed
      system defined such that longitude increases with time as
      viewed by a stationary remote observer.
        R      Jupiter to spacecraft range (positive away from
               Jupiter)

        LAT    completes the left handed, orthogonal set

        LON    System III (1965) east longitude (with longitude
               increasing eastward from a specific jovian prime
               meridian)

      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  : 48.000000
      Minimum Sampling Parameter     : 19770820120000.000000
      Maximum Sampling Parameter     : UNK
      Sampling Parameter Interval    : 48.000000
      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       48 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

        sc_r       R[J]        jovicentric (System III) spherical
        sc_lat     degrees     coordinates position vectors: range,
        sc_lon     degrees     latitude, and longitude

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

        dflag      n/a         a character string which indicates
                               software or s/c hardware intervention
                               which reduces confidence in the data
                               (NULL flags represent 'good' data)

      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-4-48.0SEC

      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_48S.TAB  62578  1979-07-05T00:00:47.269Z  1979-08-12T16:55:08.608Z
DATA_SET_RELEASE_DATE 1997-12-01T00:00:00.000Z
START_TIME 1979-07-05T12:00:47.269Z
STOP_TIME 1979-08-12T04:55:08.608Z
MISSION_NAME VOYAGER
MISSION_START_DATE 1972-07-01T12:00:00.000Z
MISSION_STOP_DATE N/A (ongoing)
TARGET_NAME JUPITER
TARGET_TYPE PLANET
INSTRUMENT_HOST_ID VG2
INSTRUMENT_NAME TRIAXIAL FLUXGATE MAGNETOMETER
INSTRUMENT_ID MAG
INSTRUMENT_TYPE MAGNETOMETER
NODE_NAME Planetary Plasma Interactions
ARCHIVE_STATUS ARCHIVED
CONFIDENCE_LEVEL_NOTE 
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.
CITATION_DESCRIPTION Ness, N.F., Connerney, J.E., Leeping, R.P., VG2-J-MAG-4-SUMM-S3COORDS-48.0SEC-V1.1, VG2 JUP MAG RESAMPLED SYSTEM III (1965) COORDS 48.0SEC V1.1, NASA Planetary Data System, 1997.
ABSTRACT_TEXT This data set includes Voyager 2 Jupiter encounter magnetometer data from the Low Field Magnetometer (LFM) resampled at a 48 second sample rate. The data are given in Jovicentric System III right handed coordinates and have been averaged from the 60 ms instrument sample rate to a 48 second resampled rate. Ephemeris data, provided in 96 second sampled System III (1965) coordinates, have been merged into the data files for this data set. The ephemeris data, generated from Voyager 2 SEDR and provided by the Voyager MAG Team, are part of the data set VG2-J-POS-6-SUMM-S3COORDS-V1.1. The position vectors for times at which ephemeris is not provided have been flagged.
PRODUCER_FULL_NAME NATIONAL SPACE SCIENCE DATA CENTER
SEARCH/ACCESS DATA
  • Planetary Plasma Interactions Website
    		•