Thermomagnetic instability of a rotating magnetized plasma disk
Abstract
We analyze the stability of a thin plasma disk which is rotating around a compact astrophysical object and is embedded in the strong magnetic field of such a source. The aim of this study is the determination of a new type of unstable modes, able to replace the magneto-rotational instability profile for low beta-values and for sufficiently small scales of the perturbations, where it fails. In particular, we consider the magneto-hydrodynamical scheme including a non-zero Nernst coefficient, corresponding to first-order collisional effects. As a result, modes with imaginary frequency lead to an instability regime when the magnetic tension vanishes. Finally, we show that, even in the presence of resistive effects, it remains a good candidate to ensure the onset of a turbulent behavior in the absence of the magneto-rotational instability.
Keywords
Cite
@article{arxiv.1309.3410,
title = {Thermomagnetic instability of a rotating magnetized plasma disk},
author = {Giovanni Montani and Riccardo Benini and Nakia Carlevaro and Alessio Franco},
journal= {arXiv preprint arXiv:1309.3410},
year = {2015}
}
Comments
6 pages, 2 figures