Direct kinetic Alfvén wave energy cascade in the presence of imbalance

  title={Direct kinetic Alfv{\'e}n wave energy cascade in the presence of imbalance},
  author={Thierry Passot and P. L. Sulem and D. Laveder},
  journal={Journal of Plasma Physics},
A two-field Hamiltonian gyrofluid model for kinetic Alfvén waves retaining ion finite Larmor radius corrections and parallel magnetic field fluctuations is used to study direct turbulent cascades from the magnetohydrodynamic to the sub-ion scales. For moderate energy imbalance and weak enough magnetic fluctuations, the spectrum of the transverse magnetic field and that of the most energetic wave display a steep transition zone near the ion scale, while the parallel transfer (and thus the… 


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