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Ann. Geophys., 21, 1955-1964, 2003
www.ann-geophys.net/21/1955/2003/
© European Geosciences Union 2003
Multi-scale magnetic field intermittence in the plasma sheet
Z. Vörös1, W. Baumjohann1, R. Nakamura1, A. Runov1, T. L. Zhang1, M. Volwerk1, H. U. Eichelberger1, A. Balogh2, T. S. Horbury2, K.-H. Glaßmeier3, B. Klecker4, and H. Rème5
1Institut für Weltraumforschung der ÖAW, Graz, Austria
2Imperial College, London, UK
3TU Braunschweig, Germany
4Max-Planck-Institut für extraterrestrische Physik, Garching, Germany
5CESR/CNRS, Toulouse, France
Abstract. This paper demonstrates
that intermittent magnetic field fluctuations in the plasma sheet exhibit
transitory, localized, and multi-scale features. We propose a multifractal-based
algorithm, which quantifies intermittence on the basis of the statistical
distribution of the "strength of burstiness", estimated within a
sliding window. Interesting multi-scale phenomena observed by the Cluster
spacecraft include large-scale motion of the current sheet and bursty bulk flow
associated turbulence, interpreted as a cross-scale coupling (CSC) process.
Key words. Magnetospheric physics (magnetotail;
plasma sheet) – Space plasma physics (turbulence)
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