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Radio sources of low power are the most common in the universe. Their jetstypically move at nonrelativistic velocity and show plume-like morphologiesthat in many instances appear distorted and bent. We investigate the role ofmagnetic field on the propagation and evolution of low-power jets and theconnection between the field intensity and the resulting morphology. Theproblem is addressed by means of three-dimensional magnetohydrodynamic (MHD)simulations. We consider supersonic jets that propagate in a stratified medium.The ambient temperature increases with distance from the jet origin maintainingconstant pressure. Jets with low magnetization show an enhanced collimation atsmall distances with respect to hydrodynamic (HD) cases studied in a previouspaper. These jets eventually evolve in a way similar to the HD cases. Jets withhigher magnetization are affected by strong nonaxisymmetric modes that lead tothe sudden jet energy release. From there on, distorted plumes of jet materialmove at subsonic velocities. This transition is associated with the formationof structures reminiscent of the `warm spots' observed in wide-angle-tail (WAT)sources.

Making Faranoff-Riley I radio sources II. The effects of jet magnetization