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.

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.

extracted metadata from PDS3 catalog and
                    modified to comply with PDS4 Information Model

GAS INSTRUMENT for ULY

COSPIN-ANISOTROPY TELESCOPE for ULY

COSPIN-HIGH ENERGY TELESCOPE for ULY

COSPIN-HIGH FLUX TELESCOPE for ULY

COSPIN-KIEL ELECTRON TELESCOPE for ULY

COSPIN-LOW ENERGY TELESCOPE for ULY

ENERGETIC PARTICLE COMPOSITION INSTRUMENT for ULY

SOLAR X-RAY/COSMIC GAMMA-RAY BURST INSTRUMENT for ULY

GRAVITATIONAL WAVE EXPERIMENT for ULY

HELIOSPHERIC INST-SPECTRA,COMPOSITION,ANISOTROPY AT LOW ENER for ULY

SOLAR CORONA EXPERIMENT for ULY

SOLAR WIND ION COMPOSITION SPECTROMETER for ULY

SOLAR WIND OBSERVATIONS OVER THE POLES OF THE SUN for ULY

ULYSSES DUST DETECTION SYSTEM for ULY

UNIFIED RADIO AND PLASMA WAVE EXPERIMENT for ULY

VECTOR HELIUM/FLUXGATE MAGNETOMETERS for ULY

INTERNATIONAL SOLAR POLAR MISSION

ULYSSES

NAIF ID 599

Jupiter

Ulysses Gas Instrument

Description

Identifier (LID)

Version