Properties of the first-order Fermi acceleration in fast magnetic reconnection driven by turbulence in collisional magnetohydrodynamical flows

摘要: Fast magnetic reconnection may occur in different astrophysical sources, producing flare-like emission and particle acceleration. Currently, this process is being studied as an efficient mechanism to accelerate particles via a first-order Fermi process. In work we analyse the acceleration rate energy distribution of test injected three-dimensional magnetohydrodynamical (MHD) domains with large-scale current sheets where made fast by presence turbulence. We study dependence time relevant parameters embedded turbulence, i.e., Alfv\'en speed $V_{\rm A}$, injection power $P_{\rm inj}$ scale $k_{\rm ($k_{\rm inj} = 1/l_{\rm inj}$). find that follows power-law kinetic energy: $t_{acc} \propto E^{\alpha}$, $0.2 < \alpha 0.6$ for vast range values $c / V_{\rm A} \sim 20 - 1000$. The decreases (and therefore velocity) expected, having approximate (V_{\rm c)^{-\kappa}$, $\kappa 2.1- 2.4$ reaching energies between $1 100 \, m_p c^2$, respectively. Furthermore, only weakly dependent on $l_{\rm spectrum develops high-energy tail which can be fitted hard already early times acceleration, consistency results studies collisionless plasmas.