CIS: Cluster Ion Spectrometry experiment
Principal Investigator: Iannis Dandouras, Institut de Recherche en Astrophysique et Planétologie (IRAP)
Analyses the composition, mass and distribution functions of ions in the nearby (magnetosphere) space plasma and in the solar wind during each four second spin of the spacecraft. (Space plasma is a gas composed of electrically charged particles, mainly electrons and protons plus some other ions.) It consists of two different instruments, a Hot Ion Analyser (HIA) and a time-of-flight ion Composition and Distribution Function analyser (CODIF), plus a sophisticated instrument control and data processing system, which permits extensive onboard data processing.