A turbulent ring and dynamo in a precessing sphere

A new ring structure of high activity, both in vorticity and magnetic flux density, is observed in MHD turbulence in a precessing sphere of which the spin and precession axes are orthogonal. This ring is fixed to the precession frame being localized near a great circle whose normal is inclined slightly from the spin axis. Both the velocity and magnetic fields are activated near the cross sections of the ring with the equatorial plane, and their fluctuations make a prograde motion.