Contents

10 January 2020
Vol 367, Issue 6474

About The Cover

Cover image expansion

COVER An artist's impression of multiwavelength emission above a thunderstorm, based on data from the Atmosphere-Space Interactions Monitor on the International Space Station. The high electric field associated with lightning (light blue) generates a terrestrial gamma-ray flash (magenta). The resulting electromagnetic pulse causes an elve—an expanding ring of ultraviolet emission (red and white). See page 183.
Image: Birkeland Centre for Space Science, Daniel Schmelling/Mount Visual