Exploration of Kronian Magnetosheath Turbulence Using Cassini Data

L. Z. Hadid (1) , Fouad Sahraoui (1) , Alessandro Retinò (1) , Ronan Modolo (2) , K. H. Kiyani (1) , Patrick Canu (1) , A. Masters (3) , M. K. Dougherty (3)

1 LPP - Laboratoire de Physique des Plasmas
2 HELIOS - LATMOS
3 Department of Physics [Imperial College London]

The power density spectra and the magnetic compressibility in Saturn's magnetosheath are investigated using in-situ measurements of the fields and particles from Cassini spacecraft mission. Two major results are found. 1) The absence of the f-5/3 Kolmogorov-like inertial range: the averaged magnetic power spectral densities indicate that the spectra jump from a 1/f scaling at the large scales (typical for solar wind spectra, Leamon et al. 1999) directly into the ion scales with a slope of - 2.5 ,without forming any 5/3 inertial range. Furthermore 2) computing the magnetic compressibility we show the dominance of the compressible magnetosonic modes at the kinetic scales compared with Kinetic Alfven Waves (KAW) reported in the solar wind (Sahraoui et al 2009 )

Domaines: Physique des plasmas [physics.plasm-ph]; Astrophysique [astro-ph]

L. Z. Hadid, Fouad Sahraoui, Alessandro Retinò, Ronan Modolo, K. H. Kiyani, et al.. Exploration of Kronian Magnetosheath Turbulence Using Cassini Data. European Planetary Science Congress 2014, Sep 2014, Cascais, Portugal. pp.EPSC2014-557. ⟨hal-02800163⟩