WHISTLER TURBULENCE FORWARD CASCADE VERSUS INVERSE CASCADE: THREE-DIMENSIONAL PARTICLE-IN-CELL SIMULATIONS

Whistler turbulence forward cascade: Three‐dimensional particle‐in‐cell simulations

[1] The first fully three‐dimensional particle‐in‐cell (PIC) simulation of whistler turbulence in a magnetized, homogeneous, collisionless plasma has been carried out. An initial relatively isotropic spectrum of long‐wavelength whistlers is imposed upon the system, with an initial electron b = 0.10. As in previous two‐dimensional simulations of whistler turbulence, the three‐dimensional system ...

Inverse cascade in decaying three-dimensional magnetohydrodynamic turbulence.

We perform direct numerical simulations of three-dimensional freely decaying magnetohydrodynamic turbulence. For helical magnetic fields, an inverse cascade effect is observed in which power is transferred from smaller scales to larger scales. The magnetic field reaches a scaling regime with self-similar evolution, and power-law behavior at high wave numbers. We also find power-law decay in the...

Inverse energy cascade in three-dimensional isotropic turbulence.

We study the statistical properties of homogeneous and isotropic three-dimensional (3D) turbulent flows. By introducing a novel way to make numerical investigations of Navier-Stokes equations, we show that all 3D flows in nature possess a subset of nonlinear evolution leading to a reverse energy transfer: from small to large scales. Up to now, such an inverse cascade was only observed in flows ...

Whistler turbulence at variable electron beta: Three-dimensional particle-in-cell simulations

[1] Three-dimensional particle-in-cell (PIC) simulations of whistler turbulence at three different initial values of ˇe are carried out on a collisionless, homogeneous, magnetized plasma model. The simulations begin with an initial ensemble of relatively long-wavelength whistler modes and follow the temporal evolution of the fluctuations as wave-wave interactions lead to a forward cascade into ...

Energy dissipation by whistler turbulence: Three-dimensional particle-in-cell simulations