Experiment             Mass,kg    Range             Objectives

PROBE
Atmospheric Structure     4    Temp.: 0-540 K       Determine temperature,
Instrument (ASI)               Pressure: 0-28 bars  pressure, density, and 
                                                    molecular weight as a
                                                    function of altitude

Neutral Mass              11   Covers 1-150 AMU     Determine chemical
Spectrometer (NMS)                                  composition of atmosphere

Helium Abundance          1    Accuracy:  0.1%      Determine relative
Detector (HAD)                                      abundance of helium

Nephelometer (NEP)        5    0.2-20-micrometer    Detect clouds and infer 
                               particles, as few    states of particles
                               3/cm?3               (liquid versus solid)

Net-Flux Radiometer       3    6 infrared filters   Determine ambient thermal
(NFR)                          from 0.3 to > 100    and solar energy as a 
                               micrometers          function of altitude

Lightning and Energetic   2    Fisheye lens         Verify the existence of
Particles (LRD/EPI)            sensors: 1 Hz-       lightning and measure 
                               100 kHz              energetic particles in 
                                                    inner Magnetosphere

ORBITER
Solid-State Imaging       30   1500-mm, f/8.5       Map Galilean satellites at
(SSI)                          800 x 800 CCD,       roughly 1-km resolution and 
                               8 filters,           monitor atmospheric
                               0.47 deg field of    circulation over 22 months 
                               view                 while in orbit around planet

Near-Infrared Mapping     20   0.7-5.2-micrometer   Observe Jupiter and its
Spectrometer (NIMS)            range, 0.03-         satellites in the infrared
                               micrometer           to study satellite surface
                               resolution           composition, jovian
                                                    atmospheric composition 
                                                    and temperature

Ultraviolet               5    1150-4300 angstroms  Measure gases and aerosols
Spectrometer (UVS)                                  in jovian atmosphere

Extreme Ultraviolet       12   0.05-0.14            Measure Io plasma torus, 
Spectrometer (EUV)             micrometers          temperature scale height, 
                                                    and composition; monitor
                                                    aurora

Photopolarimeter-         5    Discrete visible     Determine distribution and
Radiometer (PPR)               and near-infrared    character of atmospheric
                               radiometry to >42    particles; compare flux of 
                               micrometers          thermal radiation to 
                                                    incoming solar levels

Magnetometer (MAG)        5    32-16,384 gammas     Monitor magnetic field for 
                                                    strength and changes

Heavy Ion Counter         8    10 MeV-200 MeV       Monitor highly ionizing
(HIC)                                               energetic particles

Energetic Particle        11   Ions:  0.020-55 MeV  Measure high-energy
Detector (EPD)                 Electrons:  0.015-11 electrons, protons, and 
                               MeV                  heavy ions in and around
                                                    jovian magnetosphere

Plasma Detector (PLS)     13   1 eV-50 keV in 64    Assess composition, energy, 
                               bands                and three-dimensional
                                                    distribution of low-
                                                    energy electrons and ions

Plasma Wave (PWS)         7    6-31 Hz,             Detect electromagnetic waves 
                               50 Hz-200 kHz,       and analyze wave-particle
                               0.1-5.65 Mhz         interactions

Dust Detector (DDS)       4    10-16-10-6g,         Measure particle mass, 
                               2-50 km/sec          velocity, and charge

Radio Science (RS):      N/A   S-and X-band         Determine mass of Jupiter
Celestial Mechanics            signals              and its satellites (uses 
                                                    radio system and
                                                    high-gain antenna)

Radio Science (RS):      N/A   S-and X-band          Measure jovian atmospheric
Propagation                    signals               structure and body radii 
                                                     (uses radio system and
                                                     high-gain antenna)