Solar anatomy image by NASA (IMAGE) University of Sydney Caption Illustration of the Sun's anatomy depicting existing solar theory, which assumes circular convection cells in the outer convection zone. New theory proposes thin, tall 'cigar-shaped' convection cells, driving the Sun's magnetic dynamo. Credit NASA Usage Restrictions No restrictions. License Public Domain 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.