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Article Dans Une Revue Comptes Rendus. Physique Année : 2011

Observation and theoretical modeling of electron scale solar wind turbulence

Fouad Sahraoui
M. L. Goldstein
  • Fonction : Auteur
K. Abdul-Kader
  • Fonction : Auteur
Laurence Rezeau
Patrick Canu

Résumé

Turbulence at MagnetoHydroDynamics (MHD) scales in the solar wind has been studied for more than three decades, using data analysis, theoretical and numerical modeling. However, smaller scales have not been explored until very recently. Here, we review recent results on the first observation of cascade and dissipation of the solar wind turbulence at the electron scales. Thanks to the high resolution magnetic and electric field data of the Cluster spacecraft, we computed the spectra of turbulence up to (in the spacecraft reference frame) and found evidence of energy dissipation around the Doppler-shifted electron gyroscale . Before its dissipation, the energy is shown to undergo two cascades: a Kolmogorov-like cascade with a scaling above the proton gyroscale, and a new cascade at the sub-proton and electron gyroscales. Above the spectrum has a steeper power law down to the noise level of the instrument. Solving numerically the linear Maxwell–Vlasov equations combined with recent theoretical predictions of the Gyro-Kinetic theory, we show that the present results are consistent with a scenario of a quasi-two-dimensional cascade into Kinetic Alfvén modes (KAW). New analyses of other data sets, where the Cluster separation (of about ) allowed us to explore the sub-proton scales using the k-filtering technique, and to confirm the 2D nature of the turbulence at those scales.
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Dates et versions

hal-01553761 , version 1 (03-07-2017)

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Fouad Sahraoui, M. L. Goldstein, K. Abdul-Kader, Gérard Belmont, Laurence Rezeau, et al.. Observation and theoretical modeling of electron scale solar wind turbulence. Comptes Rendus. Physique, 2011, 12 (2), pp.132-140. ⟨10.1016/j.crhy.2010.11.008⟩. ⟨hal-01553761⟩
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