Thermo-galvanometric instabilities in magnetized plasma disks

PHYSICA D-NONLINEAR PHENOMENA

卷:288

Article

Franco, Alessio¹  Montani, Giovanni^1,2  Carlevaro, Nakia¹ 

[1] Univ Roma La Sapienza, Dept Phys, I-00185 Rome, Italy

[2] ENEA CR Frascati, Unita Tecn Fus, ENEA, I-00044 Rome, Italy

关键词: Accretion disks;    Plasma astrophysics;    Magneto-hydrodynamics;   

DOI  :  10.1016/j.physd.2014.08.001

来源: Elsevier

【 摘 要 】

In this work, we present a linear stability analysis of fully-ionized rotating plasma disks with a temperature gradient and a sub-thermal background magnetic field (oriented towards the axial direction). We describe how the plasma reacts when galvanometric and thermo-magnetic phenomena, such as Hall and Nernst-Ettingshausen effects, are taken into account, and meridian perturbations of the plasma are considered. It is shown how, in the ideal case, this leads to a significant overlap of the Magneto-rotational Instability and the Thermo-magnetic one. Considering dissipative effects, an overall damping of the unstable modes, although not sufficient to fully suppress the instability, appears especially in the thermo-magnetic related branch of the curve. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

Free