Nonlinear simple wave behaviour.
Brunetti G., Valentini F., Malara F.
II - Fisica della materia
Aula 32B-2 - Mercoledì 19 h 09:00 - 13:00
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Kinetic effects, like Landau damping, are known to be active on compressive magnetohydrodynamic (MHD) modes, even at wavelengths much larger than ion scales. Damping rates have been calculated for low amplitude waves, but for larger amplitudes nonlinear phenomena, like steepening and shock formation, could modify the kinetic dynamics. In this work we investigate this problem by Hybrid Vlasov-Maxwell simulations of MHD simple waves, exact nonlinear solutions of MHD equations. We explored different regimes, from the linear to the strongly nonlinear one, elucidating the competition between kinetic and nonlinear effects. The results are relevant in the framework of MHD turbulence.