The Evolution of the Whirl of the Vortex (image) American Institute of Physics Share Print E-Mail Caption The evolution of the whirl of the vortex, as the model progresses from 37 seconds and 42 seconds. Increasing turbulence in the flow causes variations in the whirl and leads to periodic cycling of the magnetic field, such as is observed with the sun. Credit Varela/Brun/Dubrulle/Nore Usage Restrictions This image may be used only with appropriate caption and credit. 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.