Shear Flow Instabilities in Low-Beta Space Plasmas
Authors: Siversky, Taras; Voitenko, Yuriy; Goossens, Marcel
Source: Space Science Reviews, Volume 121, Numbers 1-4, November 2005 , pp. 343-351(9)
Abstract:We study instabilities driven by a sheared plasma flow in the low-frequency domain. Two unstable branches are found: the ion-sound mode and the kinetic Alfvén mode. Both instabilities are aperiodic. The ion-sound instability does not depend on the plasma (gas/magnetic pressure ratio) and has a maximum growth rate of about 0.1 of the velocity gradient dV 0/dx. On the other hand, the kinetic Alfvén instability is stronger for larger and dominates the ion-sound instability for > 0.05. Possible applications for space plasmas are shortly discussed.
Document Type: Research Article
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Publication date: 2005-11-01