Magnetohydrodynamic Shear Instabilities
Arising From Interacting Vorticity Waves
Author(s)
E. Heifetz & J. Mak
Abstract
The presence of a background magnetic field is known to have a stabilising as well
as a destabilising effect for shear flow instabilities. To explain the reason for this,
we extend the Counter-propagating Rossby Waves mechanism, well known in the
geophysical fluid dynamics community, to the magnetohydrodynamic setting. It is
demonstrated here that wave displacement leads to a magnetic field configuration
that results in an appropriate vorticity distribution, and, via the non-local velocity
field generated by the local vorticity anomalies, action-at-a-distance results in a
constructive interaction between two waves and leads to shear instability. The
existence of shear instability then rests upon whether the chosen basic state
supports such a configuration required for constructive interference.
Keywords: shear instability mechanism, magnetohydrodynamics, vorticity actionat-
a-distance.
Keywords
shear instability mechanism, magnetohydrodynamics, vorticity actionat-
a-distance.
Related Book
Other papers in this volume
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