On the nature of MHD and kinetic scale turbulence in the magnetosheath of Saturn: Cassini observations

Lina Hadid 1 Fouad Sahraoui 1 K. H. Kiyani 1 A. Retino 1 Ronan Modolo 2 P. Canu 1 A. Masters 3 M. Dougherty 3
1 LPP - Laboratoire de Physique des Plasmas
2 HEPPI - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
3 Space and Atmospheric Physics Group [London]
Blackett Laboratory
Abstract : Low frequency turbulence in Saturn’s magnetosheath is investigated using in-situ measurements of the Cassini spacecraft. We focus on the magnetic en- ergy spectra computed in the frequency range ∼ [10−4 , 1]Hz. Three main results are reported: 1) The magnetic energy spectra showed a ∼ f−1 scaling at MHD scales followed by an ∼ f−2.6 scaling at the sub-ion scales without forming the so-called inertial range, breaking the universality of the Kolmogorov spectrum in the magnetosheath; 2) The magnetic com- pressibility and the cross-correlation between the par- allel component of the magnetic field and density fluctuations C(δn, δB||) indicate the dominance of the compressible magnetosonic slow modes at MHD scales rather than the Alfvén mode [3] ; 3) Higher order statistics revealed a monofractal (resp. multi- fractal) behaviour of the turbulent flow behind a quasi- perpendicular (resp. quasi-parallel) shock at the sub- ion scales.
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https://hal-insu.archives-ouvertes.fr/insu-01208805
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Submitted on : Friday, October 2, 2015 - 8:26:30 PM
Last modification on : Wednesday, May 15, 2019 - 3:57:07 AM

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Lina Hadid, Fouad Sahraoui, K. H. Kiyani, A. Retino, Ronan Modolo, et al.. On the nature of MHD and kinetic scale turbulence in the magnetosheath of Saturn: Cassini observations. European Planetary Science Congress 2015, Sep 2015, Nantes, France. pp.EPSC2015-306. ⟨insu-01208805⟩

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