Stochastic Particle Acceleration in Multiple Magnetic Islands during Reconnection

Дата и время публикации : 2012-01-04T07:05:46Z

Авторы публикации и институты :
Masahiro Hoshino

Ссылка на журнал-издание: Physical Review Letters, 108, 135003 (2012)
Коментарии к cтатье: Ссылка на журнал-издание не найдена
Первичная категория: astro-ph.HE

Все категории : astro-ph.HE

Краткий обзор статьи: 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.

Category: Physics