Data Set Information
DATA_SET_NAME VG2 NEP MAG RESAMP RDR HELIOGRAPHIC COORDINATES 9.6SEC V1.0
DATA_SET_ID VG2-N-MAG-4-RDR-HGCOORDS-9.6SEC-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION Voyager 2 9.6 second resampled data in Heliographic coordinates from the Low Field Magnetometer (LFM) from Voyager 2 during the Neptune encounter.
DATA_SET_DESCRIPTION 
Data Set Overview
  =================
    This data set includes data from the Low Field Magnetometer (LFM)
    during the inbound Neptune encounter beginning in the solar wind
    and continuing until the first magnetopause crossing. The
    magnetometer are given in Heliographic coordinates and the data have
    been averaged from the 1.92 second averages
    to a 9.6 second resampled rate. The dataset consists of the
    following columns: 1) ctime (decimal seconds since
    1966-01-01T00:00:00.000), 2) pdstime (ISO standard time format),
    3-5) spacecraft clock (m65536,m60,fds-line), 6) magnetometer id
    (1 = LFM, 2 = HFM), 7), Br (radial component), 8) Bt (tangential
    component), 9) Bn (normal component), 10) Bmag  (magnitude of the
    average components), 11) avg_Bmag (average of the magnitude
    of the raw components), 12) Lambda (longitude = tan^-1(Bt/Br)),
    13) Delta (latitude = sin^-1(Bn/avg_Bmag) ),
    14-16) rms vector (Pythagorean root mean square deviation
    of the component averages), 17) npts (number of points in average),
    18) flag a character string which indicates software or s/c hardware
    intervention which reduces confidence in the data (NULL flags
    represent 'good' data).


  Parameters
  ==========

    Derived Parameters
    ------------------
      Sampling Parameter Name             : time
      Sampling Parameter Resolution       : 0.06 seconds
      Minimum Sampling Parameter          : 0.06 seconds
      Maximum Sampling Parameter          : 0.06 seconds
      Sampling Parameter Interval         : 9.6 seconds
      Minimum Available Sampling Interval : 9.6 seconds
      Data Set Parameter Name             : magnetic field vector
      Noise Level                         : 0.006 nT
      Data Set Parameter Unit             : nanotesla

      Magnetic field vector: A derived parameter which combines the 3
      orthogonal magnetic field component measurements.

    Measured Parameters
    -------------------
      Magentic field component: A measured parameter equaling the
      magnetic field strength (e.g. in nanoteslas) along a particular
      axis direction. Usually the three orthogonal axis components are
      measured by three different sensors.


  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.


  Coordinate System
  =================

    Mean Inertial Heliographic 1950 (HG) Coordinates
    ------------------------------------------------
      COORDINATE_SYSTEM_CENTER_NAME     : SUN
      COORDINATE_SYSTEM_REFERENCE_EPOCH : UNK /* 09-23-1950 */

      The Heliographic coordinate system is defined in the reference
      epoch of 1950. The unit vectors which define the coordinate
      system are as follows: X points away from the Sun towards the
      ascending node, in the solar equatorial plane, Z points along
      the Sun's spin axis, positive above the equatorial plane,
      and Y completes the right handed set.

      Position is given in terms of the following:

      RANGE (R)        - The range or R component of the spherical
                         Heliographic coordinate system is the distance
                         from the Sun's position at the reference epoch
                         to the spacecraft measured in AU.
      LATITUDE (LAT)   - The latitude component of the spherical
                         Heliographic coordinate system is the angle
                         between the solar equatorial plane of the
                         reference epoch measured in the plane that
                         contains the solar spin axis of that epoch.
      LONGITUDE (LONG) - The longitude component of the spherical
                         Heliographic coordinate system is zero in the
                         direction of the ascending node at the
                         reference epoch (X direction) and increases
                         for a body orbiting the Sun as the Earth does.

      X                - The X component of the Heliographic coordinate
                         system points away from the Sun, towards the
                         ascending node, and lies in the solar equatorial
                         plane.
      Y                - The Y vector of the Heliographic coordinate
                         system is formed by the righthanded cross
                         product of the X and Z unit vectors. It lies in
                         the solar equatorial plane and it points away
                         from the Sun, but does not extend in the
                         direction of any particular body.
      Z                - The Z component of the Heliographic coordinate
                         system is parallel to the Sun's spin axis,
                         taken as positive above the equatorial plane of
                         the Sun.
DATA_SET_RELEASE_DATE 1992-06-01T00:00:00.000Z
START_TIME 1989-08-22T12:00:47.000Z
STOP_TIME 1989-08-29T12:00:37.000Z
MISSION_NAME VOYAGER
MISSION_START_DATE 1972-07-01T12:00:00.000Z
MISSION_STOP_DATE N/A (ongoing)
TARGET_NAME NEPTUNE
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 dataset contains some data gaps and spikes. The
   dataset 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 NULL flag string indicates
   good data. Strings which contain characters may be contaminated
   in one or more ways. Some records that are obviously
   contaminated have not been flagged.


  Data Quality and Coverage
  =========================
    Table 1 contains hourly summaries of the percentage of the data
    available, data quality, and contamination codes. Tables 2 and 3
    contain descriptions of the data quality and data contamination
    ID's respectively.


    -------------------------------------------------------------------
    Table 1. Hourly Data Coverage and Quality Summaries
    -------------------------------------------------------------------
    Start Time           Mode            Percent  Qual  Contam  NumGood
    -------------------------------------------------------------------
    1989-08-22T01:00:09  ENCOUNTER        98.933   -1     -1      6307
    1989-08-22T02:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-22T03:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-22T04:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-22T05:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-22T06:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-22T07:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-22T08:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-22T09:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-22T10:00:09  ENCOUNTER        96.000   -1     -1      6120
    1989-08-22T11:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-22T12:00:09  ENCOUNTER        98.667   -1     -1      6290
    1989-08-22T13:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-22T14:00:09  ENCOUNTER        94.667   -1     -1      6035
    1989-08-22T15:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-22T16:00:09  ENCOUNTER        96.000   -1     -1      6120
    1989-08-22T17:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-22T18:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-22T19:00:09  ENCOUNTER        97.333   -1     -1      6205
    1989-08-22T20:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-22T21:00:09  ENCOUNTER        98.667   -1     -1      6290
    1989-08-22T22:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-22T23:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-23T00:00:47  ENCOUNTER        99.733   -1     -1      6358
    1989-08-23T01:00:09  ENCOUNTER        98.933   -1     -1      6307
    1989-08-23T02:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-23T03:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-23T04:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-23T05:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-23T06:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-23T07:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-23T08:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-23T09:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-23T10:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-23T11:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-23T12:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-23T13:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-23T14:00:09  ENCOUNTER        96.000   -1     -1      6120
    1989-08-23T15:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-23T16:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-23T17:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-23T18:00:09  ENCOUNTER        97.333   -1     -1      6205
    1989-08-23T19:00:09  ENCOUNTER        93.333   -1     -1      5950
    1989-08-23T20:00:09  ENCOUNTER        93.333   -1     -1      5950
    1989-08-23T21:00:09  ENCOUNTER        93.333   -1     -1      5950
    1989-08-23T22:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-23T23:00:47  ENCOUNTER        99.733   -1     -1      6358
    1989-08-24T00:00:09  ENCOUNTER        98.933   -1     -1      6307
    1989-08-24T01:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-24T02:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-24T03:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-24T04:00:47  ENCOUNTER        99.733   -1     -1      6358
    1989-08-24T05:00:09  ENCOUNTER        98.933   -1     -1      6307
    1989-08-24T06:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-24T07:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-24T08:00:09  ENCOUNTER       100.000   -1     -1      6375
    1989-08-24T09:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-24T10:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-24T11:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-24T12:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-24T13:00:08  ENCOUNTER        98.667   -1     -1      6290
    1989-08-24T14:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-24T15:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-24T16:00:08  ENCOUNTER        94.667   -1     -1      6035
    1989-08-24T17:00:08  ENCOUNTER        98.667   -1     -1      6290
    1989-08-24T18:00:08  ENCOUNTER        98.667   -1     -1      6290
    1989-08-24T19:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-24T20:00:47  ENCOUNTER        99.733   -1     -1      6358
    1989-08-24T21:00:08  ENCOUNTER        96.267   -1     -1      6137
    1989-08-24T22:00:08  ENCOUNTER        98.667   -1     -1      6290
    1989-08-24T23:00:08  ENCOUNTER        97.333   -1     -1      6205
    1989-08-25T00:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-25T01:00:08  ENCOUNTER        97.333   -1     -1      6205
    1989-08-26T00:00:47  ENCOUNTER        99.733   -1     -1      6358
    1989-08-26T01:00:08  ENCOUNTER        97.224   -1     -1      6222
    1989-08-26T02:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-26T03:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-26T04:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-26T05:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-26T06:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-26T07:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-26T08:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-26T09:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-26T10:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-26T11:00:08  ENCOUNTER        99.498   -1     -1      6375
    1989-08-26T12:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-26T13:00:08  ENCOUNTER        99.122   -1     -1      6375
    1989-08-26T14:00:08  ENCOUNTER        95.231   -1     -1      6375
    1989-08-26T15:00:08  ENCOUNTER        88.000   -1     -1      6290
    1989-08-26T16:00:08  ENCOUNTER        96.863   -1     -1      6375
    1989-08-26T17:00:08  ENCOUNTER        81.427   -1     -1      6375
    1989-08-26T18:00:08  ENCOUNTER        83.937   -1     -1      6375
    1989-08-26T19:00:08  ENCOUNTER        94.996   -1     -1      6375
    1989-08-26T20:00:08  ENCOUNTER        95.467   -1     -1      6375
    1989-08-26T21:00:08  ENCOUNTER        87.765   -1     -1      6035
    1989-08-26T22:00:08  ENCOUNTER        97.522   -1     -1      6375
    1989-08-26T23:00:08  ENCOUNTER        98.588   -1     -1      6375
    1989-08-27T00:00:08  ENCOUNTER        98.118   -1     -1      6375
    1989-08-27T01:00:08  ENCOUNTER        96.235   -1     -1      6375
    1989-08-27T02:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-27T03:00:08  ENCOUNTER        98.667   -1     -1      6290
    1989-08-27T04:00:08  ENCOUNTER        99.498   -1     -1      6375
    1989-08-27T05:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-27T06:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-27T07:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-27T08:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-27T09:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-27T10:00:47  ENCOUNTER        97.067   -1     -1      6188
    1989-08-27T11:00:08  ENCOUNTER        97.600   -1     -1      6222
    1989-08-27T12:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-27T13:00:08  ENCOUNTER        99.498   -1     -1      6375
    1989-08-27T14:00:08  ENCOUNTER        98.667   -1     -1      6290
    1989-08-27T15:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-27T16:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-27T17:00:08  ENCOUNTER        99.498   -1     -1      6375
    1989-08-27T18:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-27T19:00:08  ENCOUNTER        98.165   -1     -1      6290
    1989-08-27T20:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-27T21:00:08  ENCOUNTER        97.208   -1     -1      6205
    1989-08-27T22:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-27T23:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-28T00:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-28T01:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-28T02:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-28T03:00:08  ENCOUNTER        99.875   -1     -1      6375
    1989-08-28T04:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-28T05:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-28T06:00:08  ENCOUNTER        91.624   -1     -1      5865
    1989-08-28T07:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-28T08:00:08  ENCOUNTER        99.749   -1     -1      6375
    1989-08-28T09:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-28T10:00:08  ENCOUNTER        97.333   -1     -1      6205
    1989-08-28T11:00:08  ENCOUNTER        93.098   -1     -1      6375
    1989-08-28T12:00:08  ENCOUNTER        88.627   -1     -1      6290
    1989-08-28T13:00:08  ENCOUNTER        85.333   -1     -1      6375
    1989-08-28T14:00:08  ENCOUNTER        82.337   -1     -1      6290
    1989-08-28T15:00:08  ENCOUNTER        80.800   -1     -1      6375
    1989-08-28T16:00:08  ENCOUNTER        90.714   -1     -1      6375
    1989-08-28T17:00:08  ENCOUNTER        93.851   -1     -1      6375
    1989-08-28T18:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-28T19:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-28T20:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-28T21:00:08  ENCOUNTER        92.580   -1     -1      5950
    1989-08-28T22:00:08  ENCOUNTER        99.875   -1     -1      6375
    1989-08-28T23:00:08  ENCOUNTER       100.000   -1     -1      6375
    1989-08-29T00:00:08  ENCOUNTER        98.494   -1     -1      6375
    1989-08-29T00:00:37  ENCOUNTER         1.067   -1     -1        68


    --------------------------------------------------------------------
    Table 2. Data Quality ID Descriptions
    --------------------------------------------------------------------
    ID   Description
    --------------------------------------------------------------------
    -1   no attempt has been made to specify a data quality for this
         time range

    --------------------------------------------------------------------
    Table 3. Data Contamination ID Descriptions
    --------------------------------------------------------------------
    ID   Description
    --------------------------------------------------------------------
    -1   no evaluation of possible contamination has been made
CITATION_DESCRIPTION Connerney, J.E.P., VG2-N-MAG-4-RDR-HGCOORDS-9.6SEC-V1.0, VG2 NEP MAG RESAMP RDR HELIOGRAPHIC COORDINATES 9.6SEC V1.0, NASA Planetary Data System, 1992.
ABSTRACT_TEXT This data set includes data from the Low Field Magnetometer (LFM) during the inbound Neptune encounter beginning in the solar wind and continuing until the first magnetopause crossing. The magnetometer are given in Heliographic coordinates and the data have been averaged from the 1.92 second averages to a 9.6 second resampled rate.
PRODUCER_FULL_NAME DR. JOHN E. P. CONNERNEY
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