Stochastic Particle Acceleration in Multiple Magnetic Islands during Reconnection

Details Stochastic Particle Acceleration in Multiple Magnetic Islands during Reconnection Stochastic Particle Acceleration in Multiple Magnetic Islands during Reconnection

2012-01-04

arxiv.org/abs/1201.0837v1

Physical Review Letters, 108, 135003 (2012)

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

Scientific paper

10.1103/PhysRevLett.108.135003

A nonthermal particle acceleration mechanism involving the interaction of a charged particle with multiple magnetic islands is proposed. The original Fermi acceleration model, which assumes randomly distributed magnetic clouds moving at random velocity $V_c$ in the interstellar medium, is known to be of second-order acceleration of $O(V_c/c)^2$ owing to the combination of head-on and head-tail collisions. In this letter, we reconsider the original Fermi model by introducing multiple magnetic islands during reconnect ion instead of magnetic clouds. We discuss that the energetic particles have a tendency to be distributed outside the magnetic islands, and they mainly interact with reconnection outflow jets. As a result, the acceleration efficiency becomes first-order of $O(V_A/c)$, where $V_A$ and $c$ are the Alfv\'en velocity and the speed of light, respectively.

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