CCSD3ZF0000100000001NJPL3IF0PDSX00000001
PDS_VERSION_ID                     = PDS3

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

  OBJECT                           = INSTRUMENT_INFORMATION
    INSTRUMENT_NAME                = "ULYSSES GAS INSTRUMENT"
    INSTRUMENT_TYPE                = "GAS DETECTOR"
    INSTRUMENT_DESC                = "

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

      (excerpted from [WITTEETAL1992])

      Abstract. -- The properties (density, bulk velocity relative
      to the solar system, and temperature) of the local
      interstellar gas, represented by neutral helium penetrating
      the heliosphere, will be measured in-situ for the first time
      by the ULYSSES GAS instrument. By employing the solar
      gravitational field as a natural velocity analyser, the bulk
      velocity relative to the solar system and the temperature of
      the E as can be derived from the angular distributions of the
      particles measured in at least two widely separated points in
      the heliosphere. The gas density can be determined if a
      composition corresponding to cosmic abundances is assumed.
      The neutral particles are detected via the secondary
      electrons or ions which are emitted upon particle impact from
      a freshly deposited lithium-fluoride (LiF) layer. The
      physical principles and assumptions on which the experiment
      is based, the main technical features of the instrument, and
      first measurements in space are briefly described."
  END_OBJECT                       = INSTRUMENT_INFORMATION

  OBJECT                           = INSTRUMENT_REFERENCE_INFO
    REFERENCE_KEY_ID               = "WITTEETAL1992"
  END_OBJECT                       = INSTRUMENT_REFERENCE_INFO
  OBJECT                           = INSTRUMENT_REFERENCE_INFO
    REFERENCE_KEY_ID               = "WITTEETAL1993"
  END_OBJECT                       = INSTRUMENT_REFERENCE_INFO

END_OBJECT                         = INSTRUMENT
END