[P-EM17] Space Plasma Physics: Theory and Simulation

[PEM17-P11] Waves in kinetic scale turbulence generated from decaying Alfvén mode turbulence: Fully kinetic particle-in-cell simulation

*Shinji Saito¹ (1.National Institute of Information and Communications Technology)

Nature of kinetic scale turbulence has an important role to dissipate plasma turbulence through turbulent energy cascade from magnetohydrodynamics scales. To understand the nature of plasma turbulence generated through the turbulent cascade, a two-dimensional particle-in-cell simulation of decaying Alfvén mode turbulence has been carried out on a collisionless, homogeneous, magnetized low-beta plasma model. Superimpose of linearly polarized Alfvén mode fluctuations are initially applied as an almost isotropic narrowband spectrum at scales longer than the ion inertial length. The simulation shows that the Alfvén mode fluctuations generate several electromagnetic/electrostatic fluctuations at kinetic scales. These fluctuations show nature of magnetosonic/whistler mode waves, Alfvén/ion cyclotron mode waves, and ion acoustic mode waves. Magnetic fluctuations are present on dispersion curve of kinetic Alfvén mode waves, but they are weak compared with other mode waves.