  Transport of angular momentum is one of the thrust areas of astrophysical
flows. Instabilities and hence the turbulence generated by it has been invoked
to understand its role in angular momentum transport in hydrodynamic and
magnetohydrodynamic regime. Investigation of an unexplored region described by
the parameter space $\Omega_e^2 < 0$, $\Omega_e$ being the epicyclic frequency,
resulted in a powerful magnetohydrodynamic instability. The growth rate of this
instability is rather large and is found to depend on the wavenumber.
