Sep6 X9.3 Solar Flare (IMAGE) American Geophysical Union Caption The Sun erupted in class X-9.3 and x-2.2 flares on Sept. 6, 2017, visible to NASA's Solar Dynamics Observatory in extreme ultraviolet (171 angstrom wavelength) light. Credit NASA/GSFC/SDO Usage Restrictions include credit 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.