Thermomagnetic instability in hot discs
Edward Liverts, Michael Mond, and Vadim Urpin
TL;DR
This paper analyzes how temperature gradients and magnetic fields can cause instabilities in ionized discs, revealing conditions for wave amplification and growth rates, relevant for understanding disc dynamics.
Contribution
It provides a linear stability analysis showing the combined effects of hydromagnetic and thermomagnetic phenomena on disc stability and identifies regimes for different instabilities.
Findings
Thermomagnetic effects can amplify waves in ionized discs.
Conditions for instability growth are quantitatively derived.
Both thermomagnetic and magnetorotational instabilities can operate under certain regimes.
Abstract
A linear stability analysis of ionized discs with a temperature gradient and an external axial magnetic field is presented. It is shown that both hydromagnetic and thermomagnetic effects can lead to the amplification of waves and make discs unstable. The conditions under which the instabilities grow are found and the characteristic growth rate is calculated. The regimes at which both the thermomagnetic and magnetorotational instabilities can operate are discussed.
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