Earth's Outer Atmosphere (IMAGE) U.S. National Science Foundation Caption Large changes in the sun's energy output may drive fluctuations in Earth's outer atmosphere. Results of a study link a recent, temporary shrinking of a high atmospheric layer with a sharp drop in the sun's ultraviolet radiation levels. Credit NASA Usage Restrictions None License Licensed 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.