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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 21, issue 2
Ann. Geophys., 21, 437–456, 2003
https://doi.org/10.5194/angeo-21-437-2003
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 21, 437–456, 2003
https://doi.org/10.5194/angeo-21-437-2003
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 3.0 License.

  28 Feb 2003

28 Feb 2003

First results obtained by the Cluster STAFF experiment

N. Cornilleau-Wehrlin1, G. Chanteur1, S. Perraut1, L. Rezeau1, P. Robert1, A. Roux1, C. de Villedary1, P. Canu1, M. Maksimovic2, Y. de Conchy2, D. Hubert2, C. Lacombe2, F. Lefeuvre3, M. Parrot3, J. L. Pinçon3, P. M. E. Décréau3, C. C. Harvey4, Ph. Louarn4, O. Santolik5, H. St. C. Alleyne6, M. Roth7, T. Chust1, O. Le Contel1, and STAFF team N. Cornilleau-Wehrlin et al.
  • 1CETP/UVSQ, 10–12 Av. de l’Europe, 78140 Vélizy, France
  • 2DESPA, Observatoire de Paris, 92195 Meudon Cedex, France
  • 3LPCE, 3 A Av. de la Recherche Scientifique, 45071 Orléans Cedex 2, France
  • 4CESR, 9 Av. du Colonel Roche, 31029 Toulouse Cedex, France
  • 5Faculty of Mathematics and Physics, V Holesovickach 2, CZ-180 00 Praha 8, Czech Republic
  • 6University of Sheffield, Mapping Street, Sheffield, S1 4DU, UK
  • 7IASB, 3 Av. circulaire, B-1180 Bruxelles, Belgique

Abstract. The Spatio Temporal Analysis of Field Fluctuations (STAFF) experiment is one of the five experiments, which constitute the Cluster Wave Experiment Consortium (WEC). STAFF consists of a three-axis search coil magnetometer to measure magnetic fluctuations at frequencies up to 4 kHz, a waveform unit (up to either 10 Hz or 180 Hz) and a Spectrum Analyser (up to 4 kHz). The Spectrum Analyser combines the 3 magnetic components of the waves with the two electric components measured by the Electric Fields and Waves experiment (EFW) to calculate in real time the 5 × 5 Hermitian cross-spectral matrix at 27 frequencies distributed logarithmically in the frequency range 8 Hz to 4 kHz. The time resolution varies between 0.125 s and 4 s. The first results show the capabilities of the experiment, with examples in different regions of the magnetosphere-solar wind system that were encountered by Cluster at the beginning of its operational phase. First results obtained by the use of some of the tools that have been prepared specifically for the Cluster mission are described. The characterisation of the motion of the bow shock between successive crossings, using the reciprocal vector method, is given. The full characterisation of the waves analysed by the Spectrum Analyser, thanks to a dedicated program called PRASSADCO, is applied to some events; in particular a case of very confined electromagnetic waves in the vicinity of the equatorial region is presented and discussed.

Key words. Magnetospheric physics (magnetopause, cusp and boundary layer) – Space plasma physics (waves and instabilities; shock waves)

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