31 July 2020
Vol 369, Issue 6503

About The Cover

Cover image expansion

COVER An extreme ultraviolet image of a large (X-class) solar flare that occurred on 7 March 2012, combining observations taken at 131 Å (blue) and 171 Å (yellow) using the Solar Dynamics Observatory spacecraft. This flare disrupted radio communications on Earth. Predicting when X-class flares will occur will help to forecast Earth's space weather. See pages 504 and 587.