First multispacecraft ion measurements in and near the Earths magnetosphere with the identical Cluster ion spectrometry CIS experimentReport as inadecuate

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1 CESR - Centre d-étude spatiale des rayonnements 2 UNH - University of New Hampshire 3 MPE - Max-Planck-Institut für Extraterrestrische Physik 4 SSL - Space Sciences Laboratory Berkeley 5 IFSI - Istituto di Fisica dello Spazio Interplanetaro 6 MPAE 7 U. W. 8 IRF 9 ATL - Lockheed Martin Advanced Technology Laboratories 10 ESTEC - European Space Research and Technology Centre 11 University of Bern 12 LANL - Los Alamos National Laboratory 13 CCSAR 14 IKI - Space Research Institute of the Russian Academy of Sciences 15 UOC - University of Crete 16 CEA 17 University of Iowa Iowa 18 Dartmouth College Hannover

Abstract : On board the four Cluster spacecraft, the Cluster Ion Spectrometry CIS experiment measures the full, three-dimensional ion distribution of the major magnetospheric ions H+, He+, He++, and O+ from the thermal energies to about 40 keV-e. The experiment consists of two different instruments: a COmposition and DIstribution Function analyser CIS1-CODIF, giving the mass per charge composition with medium 22.5° angular resolution, and a Hot Ion Analyser CIS2-HIA, which does not offer mass resolution but has a better angular resolution 5.6° that is adequate for ion beam and solar wind measurements. Each analyser has two different sensitivities in order to increase the dynamic range. First tests of the instruments commissioning activities were achieved from early September 2000 to mid January 2001, and the operation phase began on 1 February 2001. In this paper, first results of the CIS instruments are presented showing the high level performances and capabilities of the instruments. Good examples of data were obtained in the central plasma sheet, magnetopause crossings, magnetosheath, solar wind and cusp measurements. Observations in the auroral regions could also be obtained with the Cluster spacecraft at radial distances of 4–6 Earth radii. These results show the tremendous interest of multispacecraft measurements with identical instruments and open a new area in magnetospheric and solar wind-magnetosphere interaction physics.

Author: H. Rème - C. Aoustin - J. M. Bosqued - I. Dandouras - B. Lavraud - J. A. Sauvaud - A. Barthe - J. Bouyssou - Th. Camus - O. Coeu



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