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Conference Papers Year : 2015

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

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Lina Hadid
Fouad Sahraoui
Alessandro Retinò
Ronan Modolo
  • Function : Author
  • PersonId : 916163
Patrick Canu

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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Dates and versions

insu-01208805 , version 1 (02-10-2015)

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  • HAL Id : insu-01208805 , version 1

Cite

Lina Hadid, Fouad Sahraoui, K. H. Kiyani, Alessandro Retinò, 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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