Vortical field amplification and particle acceleration at rippled shocks

Дата и время публикации : 2013-11-18T22:28:22Z

Авторы публикации и институты :
F. Fraschetti

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 4 pages, 3 figures; to appear in the proceedings of the RICAP-13, Roma International Conference on AstroParticle Physics
Первичная категория: astro-ph.HE

Все категории : astro-ph.HE, astro-ph.GA, physics.plasm-ph

Краткий обзор статьи: Supernova Remnants (SNRs) shocks are believed to accelerate charged particles and to generate strong turbulence in the post-shock flow. From high-energy observations in the past decade, a magnetic field at SNR shocks largely exceeding the shock-compressed interstellar field has been inferred. We outline how such a field amplification results from a small-scale dynamo process downstream of the shock, providing an explicit expression for the turbulence back-reaction to the fluid whirling. The spatial scale of the $X-$ray rims and the short time-variability can be obtained by using reasonable parameters for the interstellar turbulence. We show that such a vortical field saturation is faster than the acceleration time of the synchrotron emitting energetic electrons.

Category: Physics