Plasma Physics Seminar ( Phys 769)

Dr. Tomoya Tatsuno
Institute for Research in Electronics and Applied Physics
University of Maryland

Destabilizing effect of shear flow without inflection point in ideal MHD plasma

Abstract:  Shear flows are now thought to be important in many situations like various fusion devices,
solar and space physics.  In this talk, the destabilizing effect of shear flows which do not contain inflection
point is discussed in the scope of ideal MHD model.  The shear flow with inflection point is clearly
destabilizing, since it is itself unstable even without magnetic field (it is called Kelvin-Helmholtz instability
in classical fluid mechanics).  However, the flow without inflection point can destabilize certain kind of
equilibria.  Since this instability is not well-known, I will try to explain the connection (or difference) with
Magneto-Rotational Instability and solar tachocline physics.