CCSD3ZF0000100000001NJPL3IF0PDSX00000001
PDS_VERSION_ID                     = PDS3

RECORD_TYPE                        = STREAM
OBJECT                             = INSTRUMENT
  INSTRUMENT_HOST_ID               = ULY
  INSTRUMENT_ID                    = SWOOPS

  OBJECT                           = INSTRUMENT_INFORMATION
    INSTRUMENT_NAME                = "SOLAR WIND OBSERVATIONS OVER THE POLES
OF THE SUN"
    INSTRUMENT_TYPE                = "PLASMA INSTRUMENT"
    INSTRUMENT_DESC                = "

      Instrument Overview
      ===================

      (excerpted from: [BAMEETAL1992A])

      Abstract. -- The Solar Wind Plasma Experiment on Ulysses is
      accurately characterizing the bulk flow and internal state
      conditions of the interplanetary plasma in three dimensions on
      the way out to Jupiter. These observations will continue over
      the full range of heliocentric distances and heliographic
      latitudes reached by the probe after its encounter with
      Jupiter and consequent deflection out of the ecliptic plane.
      Solar wind electrons and ions are measured simultaneously with
      independent curved-plate electrostatic analyzers equipped with
      multiple Channel Electron Multipliers (CEMs). The CEMs are
      arranged to detect particles at chosen polar angles from the
      spacecraft spin axis; resolution in spacecraft azimuth is
      obtained by timing measurements with the spacecraft Sun clock
      as the spacecraft spins. Electrons with central energies
      extending from 0.86 eV to 814 eV are detected at seven polar
      angles and various combinations of azimuth angle to cover the
      unit sphere comprehensively, so as to enable computation of
      the pertinent electron velocity distribution parameters. As
      the average electron flux level changes with heliocentric
      distance, command control of the CEM counting intervals is
      used to extend the dynamic range. Ions are detected between
      255 eV/q and 34.4 keV/q using appropriate subsets of 16 CEMs
      at spin angles designed to provide matrices of counts as a
      function of energy per charge, azimuth angle, and polar angle
      centered on the average direction of solar-wind flow. Data
      matrices are obtained every 4 min when the spacecraft is
      actively transmitting and every 8 min during data store
      periods. These matrices contain sufficient energy and angle
      resolution to permit a detailed characterization of the ion
      velocity distributions, from which ion bulk parameters are
      derived. As the average ion flux intensity changes with
      heliocentric distance, the entrance aperture size is
      periodically optimized by command selection from a set of
      seven apertures on a disk driven by a stepping motor. Changes
      in the average solar wind flow direction relative to the
      Earth-pointing spacecraft spin axis are accommodated by
      command selection of the proper measurement matrix from a set
      of 11 matrices. In a separate mode of operation and under
      favorable conditions, heavy ions of oxygen, silicon, and iron
      at various charge levels are resolved."

  END_OBJECT                       = INSTRUMENT_INFORMATION

  OBJECT                           = INSTRUMENT_REFERENCE_INFO
    REFERENCE_KEY_ID               = "BAMEETAL1992A"
  END_OBJECT                       = INSTRUMENT_REFERENCE_INFO
  OBJECT                           = INSTRUMENT_REFERENCE_INFO
    REFERENCE_KEY_ID               = "BAMEETAL1992B"
  END_OBJECT                       = INSTRUMENT_REFERENCE_INFO

END_OBJECT                         = INSTRUMENT
END