Issue |
A&A
Volume 386, Number 2, May I 2002
|
|
---|---|---|
Page(s) | 699 - 708 | |
Section | Celestial mechanics and astrometry | |
DOI | https://doi.org/10.1051/0004-6361:20020305 | |
Published online | 15 May 2002 |
Evidence for weak MHD turbulence in the middle magnetosphere of Jupiter
1
Laboratoire CNRS CASSINI, Observatoire de la Côte d'Azur, 06304 Nice, France e-mail: saur@jhu.edu; politano@obs-nice.fr
2
NCAR/ASP/GTP, Boulder, CO 80303-7000, USA e-mail: pouquet@ucar.edu
3
Bartol Research Institute, Newark, DE, USA e-mail: yswhm@bartol.udel.edu
Corresponding author: J. Saur, saur@jhu.edu
Received:
25
June
2001
Accepted:
17
December
2001
In this paper we study the small scale-magnetic field fluctuations
of the middle Jovian magnetosphere that are embedded
in the strong background field of Jupiter in the framework
of turbulence theory.
We perform a statistical analysis of these fluctuations
using a five year set of Galileo spacecraft magnetic field data.
Calculating power spectra of the fluctuations,
we identify for the first time a spectral
index of minus two for wave vectors perpendicular to
.
These results strongly support a description of
the fluctuations within the framework of weak magnetic turbulence
and recent theoretical developments therein
by Galtier et al. ([CITE]).
In addition, we show that there is little variation of the spectral
index upon radial distance in the middle magnetosphere.
We comment also on how the presence
of such fluctuating fields might have
interesting consequences concerning transport properties
in the Jovian magnetosphere.
Key words: turbulence / MHD / planets and satellites: individual: Jupiter
© ESO, 2002
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