Energetic Particle Acceleration in a 3D Magnetic Field Reconnection Model: a Role of MHD Turbulence

Astronomy and Astrophysics – Astrophysics

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Scientific paper

A role of MHD turbulence in the cosmic ray acceleration process in a volume with the reconnecting magnetic field is studied by the method of Monte Carlo simulations. We performed modelling of proton acceleration with a 3D analytic model of stationary reconnection of Craig et al. (1995) providing the unperturbed background conditions. Perturbations of particle trajectories due to a turbulent magnetic field component were simulated with the method of small-amplitude pitch-angle momentum scattering, enabling modelling of both small and large amplitude turbulence. Comparison of the acceleration process in models involving particle trajectory perturbations to the unperturbed one reveals that the turbulence can substantially increase the acceleration efficiency, enabling particles to reach much higher final energies and generate flat particle spectra.

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