Normal and enhanced aurora (IMAGE) University of California - Berkeley Caption A normal aurora (left) consists of glowing curtains of red, green and blue. An enhanced aurora (right) contains a thin, brighter layer which exhibits much more green, possibly caused by the same physical process that creates Steve and the picket fence. Because enhanced auroras are more common, UC Berkeley researchers plan to probe them first to determine what conditions in the upper atmosphere cause the phenomena. Credit Vincent Ledvina, theauroraguy.com Usage Restrictions none License Original content 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.