  We study a new type of large-scale instability, which arises in obliquely
rotating stratified electroconductive fluid with an external uniform magnetic
field and a small-scale external force having zero helicity. This force gives
rise to small-scale oscillations of the velocity with a small Reynolds number.
Using the method of multi-scale asymptotic expansions there are obtained
nonlinear equations for vortex and magnetic perturbations in the third order in
Reynolds number. Studied is the linear stage of magneto-vortex dynamo caused by
instabilities of $\alpha$-effect type. Stationary solutions for the equations
of nonlinear magneto-vortex dynamo are found by numerical methods in the form
of localized chaotic structures.
