THE CLUSTER ION SPECTROMETRY (CIS) EXPERIMENT |
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| Authors: | H RÈME J M Bosqued J A Sauvaud A Cros J Dandouras C Aoustin J Bouyssou Th Camus J Cuvilo C Martz J L MÉDALE H Perrier D Romefort J Rouzaud C D'Uston E MÖBIUS K Crocker M Granoff L M Kistler M Popecki D Hovestadt B Klecker G Paschmann M Scholer C W Carlson D W Curtis R P Lin J P Mcfadden V Formisano E Amata M B Bavassano-CATTANEO P Baldetti G Belluci R Bruno G Chionchio A Di Lellis E G Shelley A G Ghielmetti W Lennartsson A Korth H Rosenbauer R Lundin S Olsen G K Parks M Mccarthy H Balsiger |
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| Institution: | (1) CESR, BP 4346, 31028 Toulouse Cédex 4, France;(2) UNH, Durham, U.S.A;(3) MPE, Garching, Germany;(4) SSL, Berkeley, U.S.A;(5) IFSI, Frascati, Italy;(6) Lockheed, Palo Alto, U.S.A;(7) MPAE, Lindau, Germany;(8) SISP, Kiruna, Sweden;(9) U.W., Seattle, U.S.A;(10) Bern University, Bern, Switzerland |
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| Abstract: | The Cluster Ion Spectrometry (CIS) experiment is a comprehensive ionic plasma spectrometry package on-board the four Cluster spacecraft capable of obtaining full three-dimensional ion distributions with good time resolution (one spacecraft spin) with mass per charge composition determination. The requirements to cover the scientific objectives cannot be met with a single instrument. The CIS package therefore 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 dual-processor-based instrument-control and Data-Processing System (DPS), which permits extensive on-board data-processing. Both analysers use symmetric optics resulting in continuous, uniform, and well-characterised phase space coverage. CODIF measures the distributions of the major ions (H+, He+, He++, and O+) with energies from ~0 to 40 keV/e with medium (22.5°) angular resolution and two different sensitivities. HIA does not offer mass resolution but, also having two different sensitivities, increases the dynamic range, and has an angular resolution capability (5.6° × 5.6°) adequate for ion-beam and solar-wind measurements. |
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