Particle Energization in a Chaotic Force-free/Non-Force-free Magnetic field

Tuesday, 16 December 2014
Brahmananda Dasgupta, Xiaocan Li and Gang Li, University of Alabama in Huntsville, Huntsville, AL, United States
Force-free field is believed to be a reasonable description of the quiet sun and a good approximation for low-beta plasma, like the lower region of solar corona. This field is similar to ABC field, which has been demonstrated to be chaotic. Here, we study the particle transport behavior in this field. We are particularly interested in particle energization if there is an electric field, which can be introduced by turbulent motion of plasma parcels. We expect a second order Fermi acceleration. Different spectra for turbulent motions are used, and particles with various mass-to-charge ratio are investigated. This process can provide a seed population generation mechanism for CME-driven shocks.