Spectral anisotropies in high resolution three-dimensional simulations

We present a 3D high resolution hybrid particle-in-cells simula- tion of decaying Alv ́enic turbulence and we compare its results with an analogous simulations at MHD scales. We show that, while MHD simulations show spectral anisotropies in agreement with critical balance arguments, at ion scale magnetic spectrum is more isotropic than predicted. This suggest that intermittent small- scales structures, like reconnecting current sheets can play a fundamental role in transferring energy across kinetic scales.