Direct Numerical Simulations of the Quasi-interchange Instability in Astrophysical Jets

We perform 3D numerical simulation of jets containing both the azimuthal and axial field of subthermal strength. We argue that in azimuthal and axial magnetic fields the jet is always unstable to non-axisymmetric perturbations. Stabilization does not occur even if the strengths of these field components are comparable. If the axial field is weaker than the azimuthal one, instability occurs for perturbations with any azimuthal wave number in, and the growth rate reaches a saturation value for low values of m. If the axial field is stronger than the toroidal one, the instability shows up for perturbations with relatively high m.