Video 1 (video) New York University Share Print E-Mail Loading video... Caption The meridional flow, visualized here by moving corks, sets the period of the Sun's magnetic cycle by transporting the magnetic field around the convection zone in 22 years (two sunspot cycles). Credit Courtesy of MPS (Z.-C. Liang). Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.