Speaker
Description
By using results from a 3D hybrid simulation we investigate the properties of plasma turbulence at ion scales, focusing on how the bulk-kinetic and magnetic energy is transferred into the internal energy of the particles by the pressure-strain interaction term. We analyze the time evolution of the internal and kinetic energy as well that of the pressure strain. The last exhibits a substantial oscillatory behavior, which reflects its reversibility properties, embedded in a secular evolution toward a global increase of the internal energy of the plasma which can be accounted as an effective dissipation. When the pressure strain term is separated into the gyrotropic and non-gyrotropic part the last does not show important oscillations and can be recognized as the main channel of the effective dissipation. The Kármán-Howart-Monin description of the energy balance equation reveals that the oscillations of the gyrotropic component are important mainly at the large scales while it can account of a global cooling at ion scales where the non-gyrotropic part is dominating.
