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Cluster Ion Spectrometry (CIS)


Mission Name: Cluster96
Principal Investigator:Prof. Henri Reme


This instrument (CIS: Cluster Ion Spectrometry) is capable of obtaining full 3D ion distributions with high time resolution (in one spacecraft spin) and mass-per-charge resolution. The experiment consists of two different instruments, a Hot Ion Analyzer (HIA) and a time-of-flight Ion Composition and Distribution Function analyzer (CODIF). Extensive on-board processing is done, within its dual-processor Data Processing System (DPS). CODIF determines the distributions of the major ion species with energies from spacecraft potential to 40 KeV/charge with an angular resolution of 22.5 x 10.25 degrees and with two different sensitivities. The CODIF instrument uses electrostatic deflection to select by energy per charge, with subsequent time-of-flight analysis. The sensor primarily covers the energy range 0.02--40 KeV/charge, but with additional pre-acceleration for energies below 25 eV/charge, the range is extended to energies as low as the spacecraft potential. The HIA does not measure mass, but extends the dynamic range to the highest ion fluxes, and has angular resolution capability of 5.6 x 5.6 degrees for ion-beam and solar-wind measurements. The HIA is a symmetric quadrispherical analyzer of top-hat geometry, and uses microchannel-plate electron multipliers and position encoding by discrete anodes. A 2D distribution is obtained once per 62.5 ms, and a full 3D distribution of ions in the energy range ~5 eV/charge to 32 KeV/charge is obtained every 4 s. For more details of the Cluster mission, the spacecraft, and its instruments, see the report ``Cluster: mission, payload and supporting activities,'' March 1993, ESA SP-1159, and the included article ``The Cluster Ion Spectrometry Experiment,'' by H. Reme et al., from which this information was obtained.

Alternate Names

  • CIS
  • Cluster96/CIS

Facts in Brief

Mass: 10.22 kg
Power (avg): 8.6 W
Bit rate (avg): 5.5 kbps

Funding Agency

  • Centre National de la Recherche Scientifique (France)


  • Space Physics: Zodiacal Light/Interplanet Dust
  • Space Physics: Magnetospheric Studies

Additional Information

Questions and comments about this experiment can be directed to: Dr. Ramona L. Kessel



NameRoleOriginal AffiliationE-mail
Dr. Charles W. CarlsonCo-InvestigatorUniversity of California,
Dr. Dieter K. HovestadtCo-InvestigatorMax-Planck-Institut fur Extraterrestrische Physik
Dr. Helmut R. RosenbauerCo-InvestigatorMax-Planck-Institut fur
Prof. George K. ParksCo-InvestigatorUniversity of
Prof. Robert P. LinCo-InvestigatorUniversity of California, Berkeley
Dr. Vittorio FormisanoCo-InvestigatorConsiglio Nazionale delle
Dr. Goetz PaschmannCo-InvestigatorMax-Planck-Institut fur Extraterrestrische
Prof. Hans R. BalsigerCo-InvestigatorUniversitat
Dr. Edward G. ShelleyCo-InvestigatorLockheed Palo
Dr. Axel KorthCo-InvestigatorMax-Planck-Institut fur
Dr. Arthur G. GhielmettiCo-InvestigatorLockheed Palo
Mr. David W. CurtisCo-InvestigatorUniversity of California,
Prof. Rickard LundinCo-InvestigatorSwedish Institute for Space
Dr. Jean-Michel BosquedCo-InvestigatorCNRS Centre d'Etudes Spatiale des Rayonments
Dr. Jean-Andre C. SauvaudCo-InvestigatorCNRS Centre d'Etudes Spatiale des
Dr. O. Walter LennartssonCo-InvestigatorLockheed Palo
Dr. Berndt KleckerCo-InvestigatorMax-Planck-Institut fur Extraterrestrische
Dr. Istvan SzemereyCo-InvestigatorHungarian Academy of Sciences
Dr. Eberhard S. MoebiusCo-InvestigatorUniversity of New
Dr. Roberto BrunoCo-InvestigatorConsiglio Nazionale delle
Dr. James P. McFaddenCo-InvestigatorUniversity of California,
Dr. Jannis S. DandourasCo-InvestigatorCNRS Centre d'Etudes Spatiale des
Dr. Maria Bice Bavassano-CattaneoCo-InvestigatorInstituto di Fisica dello Spazio
Prof. Lynn M. KistlerCo-InvestigatorUniversity of New
Dr. Michael P. McCarthyCo-InvestigatorUniversity of California,
Prof. Henri RemePrincipal InvestigatorCNRS Centre d'Etudes Spatiale des

Selected References

  • Reme, H., et al., The Cluster ion spectrometry experiment, in Cluster: Mission, Payload, and Supporting Activities, ESA SP-1159, pp. 133-161, Mar. 1993.
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