The Galileo spacecraft has many instruments and features that can be divided into four categories: Atmosphere Probe, Fields and Particles Science, Imaging or Remote Sensing Science, and Engineering. The five Remote Sensing Science instruments (shown as *'s in the diagram) "see" wavelengths between 1 nanometer and 100 micrometers (see the "Catch a Wave" chart). The plasma wave antenna is also starred and its wavelength range is shown on the "Catch a Wave" chart.
Fields and Particles (F & P) Science is the study of Jupiter's magnetosphere and associated fields. One F & P instrument is shown on the "Catch a Wave" chart: the Plasma Waves antenna (at radio frequencies). The other five F & P instruments are shown as (1) through (5) above.
Magnetometer Sensors (1) sense the magnetic field in the spacecraft's immediate environment.
Energetic Particles Detector (2) measures the velocity and energy of helium, oxygen, sulfur and iron ions.
Plasma Detector (3) measures the velocity and energy of hydrogen, oxygen, sodium and sulfur electrons.
Heavy Ion Counter (4) is a radiation monitor: a Jupiter-bound Geiger counter.
Dust Detector (5) measures the mass, speed, flight direction and electric charge of dust as it interacts with the magnetic, radiation and gravity fields.