First multispacecraft ion measurements in and near the Earth’s magnetosphere with the identical Cluster ion spectrometry (CIS) experiment

Первые многоспутниковые измерения ионов в магнитосфере Земли и вблизи неё с помощью идентичных экспериментов по ионной спектрометрии Cluster (CIS)
H. Rème, C. Aoustin, J. M. Bosqued, I. Dandouras, B. Lavraud, J. A. Sauvaud, Alain Barthe, J. Bouyssou, T. Camus, O. Coeur-Joly, A. Cros, J. Cuvilo, F. Ducay, Y. Garbarowitz, J. L. Médale, E. Penou, H. Perrier, D. Romefort, Jean‐Noël Rouzaud, C. Vallat, D. Alcaydé, C. Jacquey, C. Mazelle, C. d’Uston, E. Möbius, L. M. Kistler, Kyle Crocker, M. Granoff, C. Mouikis, M. Popecki, M. Vosbury, B. Klecker, D. Hovestadt, H. Kucharek, E. Kuenneth, G. Paschmann, M. Scholer, N. Sckopke, E. Seidenschwang, C. W. Carlson, D. W. Curtis, C. Ingraham, R. P. Lin, J. P. McFadden, G. K. Parks, T. D. Phan, V. Formisano, E. Amata, M. B. Bavassano‐Cattaneo, P. Baldetti, R. Bruno, G. Chionchio, A. Di Lellis, M. F. Marcucci, G. Pallocchia, A. Korth, P. W. Daly, B. Graeve, H. Rosenbauer, V. M. Vasyliūnas, M. McCarthy, M. Wilber, L. Eliasson, R. Lundin, Susanne Nautrup Olsen, E. G. Shelley, S. A. Fuselier, A. G. Ghielmetti, W. Lennartsson, C. P. Escoubet, H. Balsiger, R. H. Friedel, Jinbin Cao, R. A. Kovrazhkin, J. Papamastorakis, R. Pellat, J. Scudder, B. U. Ö. Sonnerup
2001-09-30
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Cluster Ion Spectrometryion distribution functionsmagnetospheric ionsmultispacecraft measurementssolar wind–magnetosphere interactions
Abstract (AI)
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.Key words. Magnetospheric physics (magnetopause, cusp and boundary layers; magnetopheric configuration and dynamics; solar wind - magnetosphere interactions)
Key Findings
1
CODIF provides mass-per-charge composition with 22.5° angular resolution, while HIA provides 5.6° angular resolution for resolving ion beams and solar-wind ions.
2
Each analyser has two sensitivities, extending the instruments’ dynamic range for measurements across diverse magnetospheric and solar-wind conditions.
3
Identical ion instruments on four spacecraft enable valuable multispacecraft measurements for studying magnetospheric structure, dynamics, and solar-wind interaction.
4
Initial Cluster observations demonstrated high instrument performance in the central plasma sheet, magnetopause, magnetosheath, solar wind, cusp, and auroral regions at 4–6 Earth radii.
5
The Cluster Ion Spectrometry experiment measures three-dimensional distributions of H+, He+, He++, and O+ from thermal energies to approximately 40 keV/e.
Research Object

The four-spacecraft Cluster ion spectrometry experiment and its measurements of ion distributions in and near Earth’s magnetosphere

Research Subject

The performance and measurement capabilities of identical multispacecraft ion spectrometers for resolving magnetospheric and solar-wind ion distributions across different plasma regions

Publication Details
Publication Date
2001-09-30
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Authors
H. Rème
C. Aoustin
J. M. Bosqued
I. Dandouras
B. Lavraud
J. A. Sauvaud
Alain Barthe
J. Bouyssou
T. Camus
O. Coeur-Joly
A. Cros
J. Cuvilo
F. Ducay
Y. Garbarowitz
J. L. Médale
E. Penou
H. Perrier
D. Romefort
Jean‐Noël Rouzaud
C. Vallat
D. Alcaydé
C. Jacquey
C. Mazelle
C. d’Uston
E. Möbius
L. M. Kistler
Kyle Crocker
M. Granoff
C. Mouikis
M. Popecki
M. Vosbury
B. Klecker
D. Hovestadt
H. Kucharek
E. Kuenneth
G. Paschmann
M. Scholer
N. Sckopke
E. Seidenschwang
C. W. Carlson
D. W. Curtis
C. Ingraham
R. P. Lin
J. P. McFadden
G. K. Parks
T. D. Phan
V. Formisano
E. Amata
M. B. Bavassano‐Cattaneo
P. Baldetti
R. Bruno
G. Chionchio
A. Di Lellis
M. F. Marcucci
G. Pallocchia
A. Korth
P. W. Daly
B. Graeve
H. Rosenbauer
V. M. Vasyliūnas
M. McCarthy
M. Wilber
L. Eliasson
R. Lundin
Susanne Nautrup Olsen
E. G. Shelley
S. A. Fuselier
A. G. Ghielmetti
W. Lennartsson
C. P. Escoubet
H. Balsiger
R. H. Friedel
Jinbin Cao
R. A. Kovrazhkin
J. Papamastorakis
R. Pellat
J. Scudder
B. U. Ö. Sonnerup
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