The scientific investigations of the Jupiter-Saturn missions are multipurpose, taking data in a variety of environments. For example, the ultraviolet spectrometer studies planetary and satellite atmospheres and also interplanetary and interstellar hydrogen and helium. The magnetic fields experiment will examine the magnetospheres of the planets and also search for the transition between solar and galactic regions.
It is difficult to separate ‘planetary’ from ‘interplanetary’ instruments and investigations. There is, however, another grouping.