  Goldreich-Sridhar model of incompressible turbulence provides an elegant
approach to describing strong MHD turbulence. It relies on the fact that
interacting Alfvenic waves are independent and have random polarization.
However, in case of strong interaction a spontaneous local assymetry can arise.
We used direct numerical simulations to show that polarization alignment occurs
and it grows larger at smaller scales. This effect would lead to a shallower
spectrum and stronger anisotropy. Even small changes in these two properties
will have important astrophysical consequencies, e.g. for the cosmic ray
physics.
