The influence of cosmic-rays on the magnetorotational instability

Дата и время публикации : 2011-08-08T12:10:07Z

Авторы публикации и институты :
Fazeleh Khajenabi

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: Accepted for publication in Astrophysics & Space Science
Первичная категория: astro-ph.GA

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

Краткий обзор статьи: We present a linear perturbation analysis of the magnetorotational instability in the presence of the cosmic rays. Dynamical effects of the cosmic rays are considered by a fluid description and the diffusion of cosmic rays is only along the magnetic field lines. We show an enhancement in the growth rate of the unstable mode because of the existence of cosmic rays. But as the diffusion of cosmic rays increases, we see that the growth rate decreases. Thus, cosmic rays have a destabilizing role in the magnetorotational instability of the accretion discs.

Category: Physics