Instabilities in ferrofluid

A 50 mm long magnet placed at the bottom of a petri dish with 1 mm layer of ferrofluid. Following the gradient of magnetic field, the fluid forms a hump over the magnet. First, the film of flowing liquid becomes unstable forming "jets". Then, jets become unstable breaking up into droplets. Field of view approximately 70x70 mm. Camera frame rate 250 fps, playback 30 fps.