%ANakanotani, Masaru%AZank, Gary%AZhao, Lingling%BJournal Name: Frontiers in Astronomy and Space Sciences; Journal Volume: 9
%D2022%I
%JJournal Name: Frontiers in Astronomy and Space Sciences; Journal Volume: 9
%K
%MOSTI ID: 10355947
%PMedium: X
%TParticle acceleration in an MHD-scale system of multiple current sheets
%XWe investigate particle acceleration in an MHD-scale system of multiple current sheets by performing 2D and 3D MHD simulations combined with a test particle simulation. The system is unstable for the tearing-mode instability, and magnetic islands are produced by magnetic reconnection. Due to the interaction of magnetic islands, the system relaxes to a turbulent state. The 2D (3D) case both yield −5/3 (− 11/3 and −7/3) power-law spectra for magnetic and velocity fluctuations. Particles are efficiently energized by the generated turbulence, and form a power-law tail with an index of −2.2 and −4.2 in the energy distribution function for the 2D and 3D case, respectively. We find more energetic particles outside magnetic islands than inside. We observe super-diffusion in the 2D (∼ t 2.27 ) and 3D (∼ t 1.2 ) case in the energy space of energetic particles.
%0Journal Article