HR: 1340h
AN: NG23A-1189    [Abstracts]
TI: Scaling Properties of Magnetic Fluctuations in the Earth's Plasma Sheet
AU: Voros, Z
EM: zoltan.voeroes@oeaw.ac.at
AF: Space Research Institute, Schmiedlstrasse 6, Graz, 8042 Austria
AU: Baumjohann, W
EM: baumjohann@oeaw.ac.at
AF: Space Research Institute, Schmiedlstrasse 6, Graz, 8042 Austria
AU: * Nakamura, R
EM: rumi@oeaw.ac.at
AF: Space Research Institute, Schmiedlstrasse 6, Graz, 8042 Austria
AU: Volwerk, M
EM: martin.volwerk@assoc.oeaw.ac.at
AF: Space Research Institute, Schmiedlstrasse 6, Graz, 8042 Austria
AU: Runov, A
EM: andrei.runov@oeaw.ac.at
AF: Space Research Institute, Schmiedlstrasse 6, Graz, 8042 Austria
AU: Balogh, A
EM: a.balogh@imperial.ac.uk
AF: Imperial College, H/6M67A Huxley Building, London, SW7 2AZ United Kingdom
AU: Klecker, B
EM: berndt.klecker@mpe.mpg.de
AF: Max-Planck Institute fuer Extraterrestrische Physik, Postfach 1312, Garching, 85741 Germany
AU: Reme, H
EM: reme@.cesr.fr
AF: CESR, BP 4346, Toulouse, 31028 France
AB: In situ observations of the ion velocity and magnetic field in the plasma sheet have revealed intermittent fluctuations in the temporal and spatial domains. These observations were attributed to turbulence. Any description of fluctuating fields in terms of turbulence, however, requires certain multi-scaling characteristics to be present in the observed data. Since the specific occurrence of magnetic fluctuations strongly depends on the spatio-temporal non-steady conditions in the plasma sheet, the application of turbulence methodology should always be accompanied by a thorough analysis of the multi-scaling features in relation to the physical conditions during the analyzed intervals. In order to investigate the scaling properties of magnetic fluctuations, we employ wavelet methods together with a rescaling technique of empirical probability density functions for bursty-bulk flow and non-flow associated intervals in the plasma sheet. We show that both non-scaling and multi-scaling fluctuations are present. In the latter case the scalings, and the range of scales exhibiting characteristics of magnetohydrodynamic turbulence, differ significantly from the fluctuations occurring below the dissipation scale.
DE: 2764 Plasma sheet
SC: Nonlinear Geophysics [NG]
MN: 2004 AGU Fall Meeting